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Finding the Fourth Proportional to 39,871.40, 59,792.70 and 20,143.40

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Solution

The fourth proportional to 39,871.40, 59,792.70 and 20,143.40 is: 30,207.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,871.40 : 59,792.70 = 20,143.40 : x
  2. Step 2: Convert to fraction form
    39,871.40/59,792.70 = 20,143.40/x
  3. Step 3: Cross multiply
    39,871.40x = 59,792.70 × 20,143.40
  4. Step 4: Simplify right side
    39,871.40x = 1,204,428,273.18
  5. Step 5: Solve for x
    x = 1,204,428,273.18/39,871.40
  6. Step 6: Final answer
    x = 30,207.82

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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.