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Finding the Fourth Proportional to 39,892.53, 55,052.07 and 21,988.20

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Solution

The fourth proportional to 39,892.53, 55,052.07 and 21,988.20 is: 30,343.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,892.53 : 55,052.07 = 21,988.20 : x
  2. Step 2: Convert to fraction form
    39,892.53/55,052.07 = 21,988.20/x
  3. Step 3: Cross multiply
    39,892.53x = 55,052.07 × 21,988.20
  4. Step 4: Simplify right side
    39,892.53x = 1,210,495,925.57
  5. Step 5: Solve for x
    x = 1,210,495,925.57/39,892.53
  6. Step 6: Final answer
    x = 30,343.92

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.