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Finding the Fourth Proportional to 128,748, 177,657.84 and 72,151.20

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Solution

The fourth proportional to 128,748, 177,657.84 and 72,151.20 is: 99,560.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,748 : 177,657.84 = 72,151.20 : x
  2. Step 2: Convert to fraction form
    128,748/177,657.84 = 72,151.20/x
  3. Step 3: Cross multiply
    128,748x = 177,657.84 × 72,151.20
  4. Step 4: Simplify right side
    128,748x = 12,818,226,345.41
  5. Step 5: Solve for x
    x = 12,818,226,345.41/128,748
  6. Step 6: Final answer
    x = 99,560.59

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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.