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Finding the Fourth Proportional to 128,390.96, 177,178.92 and 71,802.56

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Solution

The fourth proportional to 128,390.96, 177,178.92 and 71,802.56 is: 99,087.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,390.96 : 177,178.92 = 71,802.56 : x
  2. Step 2: Convert to fraction form
    128,390.96/177,178.92 = 71,802.56/x
  3. Step 3: Cross multiply
    128,390.96x = 177,178.92 × 71,802.56
  4. Step 4: Simplify right side
    128,390.96x = 12,721,900,034.04
  5. Step 5: Solve for x
    x = 12,721,900,034.04/128,390.96
  6. Step 6: Final answer
    x = 99,087.19

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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.