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Finding the Fourth Proportional to 21,987.04, 32,987.28 and 6,993.28

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Solution

The fourth proportional to 21,987.04, 32,987.28 and 6,993.28 is: 10,492.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,987.04 : 32,987.28 = 6,993.28 : x
  2. Step 2: Convert to fraction form
    21,987.04/32,987.28 = 6,993.28/x
  3. Step 3: Cross multiply
    21,987.04x = 32,987.28 × 6,993.28
  4. Step 4: Simplify right side
    21,987.04x = 230,689,285.48
  5. Step 5: Solve for x
    x = 230,689,285.48/21,987.04
  6. Step 6: Final answer
    x = 10,492.06

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Half scale
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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.