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Finding the Fourth Proportional to 128,013.71, 176,655.25 and 71,423.87

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Solution

The fourth proportional to 128,013.71, 176,655.25 and 71,423.87 is: 98,562.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,013.71 : 176,655.25 = 71,423.87 : x
  2. Step 2: Convert to fraction form
    128,013.71/176,655.25 = 71,423.87/x
  3. Step 3: Cross multiply
    128,013.71x = 176,655.25 × 71,423.87
  4. Step 4: Simplify right side
    128,013.71x = 12,617,402,141.74
  5. Step 5: Solve for x
    x = 12,617,402,141.74/128,013.71
  6. Step 6: Final answer
    x = 98,562.90

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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.