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Finding the Fourth Proportional to 128,708.20, 193,062.30 and 39,988.90

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Solution

The fourth proportional to 128,708.20, 193,062.30 and 39,988.90 is: 59,983.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,708.20 : 193,062.30 = 39,988.90 : x
  2. Step 2: Convert to fraction form
    128,708.20/193,062.30 = 39,988.90/x
  3. Step 3: Cross multiply
    128,708.20x = 193,062.30 × 39,988.90
  4. Step 4: Simplify right side
    128,708.20x = 7,720,349,008.47
  5. Step 5: Solve for x
    x = 7,720,349,008.47/128,708.20
  6. Step 6: Final answer
    x = 59,983.35

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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.