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Finding the Fourth Proportional to 138,718.79, 191,432.21 and 77,464.68

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Solution

The fourth proportional to 138,718.79, 191,432.21 and 77,464.68 is: 106,901.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,718.79 : 191,432.21 = 77,464.68 : x
  2. Step 2: Convert to fraction form
    138,718.79/191,432.21 = 77,464.68/x
  3. Step 3: Cross multiply
    138,718.79x = 191,432.21 × 77,464.68
  4. Step 4: Simplify right side
    138,718.79x = 14,829,234,758.29
  5. Step 5: Solve for x
    x = 14,829,234,758.29/138,718.79
  6. Step 6: Final answer
    x = 106,901.41

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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.