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Finding the Fourth Proportional to 21,990.30, 32,985.45 and 20,532.30

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Solution

The fourth proportional to 21,990.30, 32,985.45 and 20,532.30 is: 30,798.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,990.30 : 32,985.45 = 20,532.30 : x
  2. Step 2: Convert to fraction form
    21,990.30/32,985.45 = 20,532.30/x
  3. Step 3: Cross multiply
    21,990.30x = 32,985.45 × 20,532.30
  4. Step 4: Simplify right side
    21,990.30x = 677,267,155.04
  5. Step 5: Solve for x
    x = 677,267,155.04/21,990.30
  6. Step 6: Final answer
    x = 30,798.45

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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.