Home / 14,520.06-21,780.12-3,990.21

Finding the Fourth Proportional to 14,520.06, 21,780.12 and 3,990.21

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Solution

The fourth proportional to 14,520.06, 21,780.12 and 3,990.21 is: 5,985.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    14,520.06 : 21,780.12 = 3,990.21 : x
  2. Step 2: Convert to fraction form
    14,520.06/21,780.12 = 3,990.21/x
  3. Step 3: Cross multiply
    14,520.06x = 21,780.12 × 3,990.21
  4. Step 4: Simplify right side
    14,520.06x = 86,907,252.63
  5. Step 5: Solve for x
    x = 86,907,252.63/14,520.06
  6. Step 6: Final answer
    x = 5,985.32

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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.