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Finding the Fourth Proportional to 128,511.33, 177,345.61 and 71,922.71

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Solution

The fourth proportional to 128,511.33, 177,345.61 and 71,922.71 is: 99,253.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,511.33 : 177,345.61 = 71,922.71 : x
  2. Step 2: Convert to fraction form
    128,511.33/177,345.61 = 71,922.71/x
  3. Step 3: Cross multiply
    128,511.33x = 177,345.61 × 71,922.71
  4. Step 4: Simplify right side
    128,511.33x = 12,755,176,080.98
  5. Step 5: Solve for x
    x = 12,755,176,080.98/128,511.33
  6. Step 6: Final answer
    x = 99,253.32

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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.