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Finding the Fourth Proportional to 128,356.93, 177,078.31 and 85,929.13

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Solution

The fourth proportional to 128,356.93, 177,078.31 and 85,929.13 is: 118,545.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,356.93 : 177,078.31 = 85,929.13 : x
  2. Step 2: Convert to fraction form
    128,356.93/177,078.31 = 85,929.13/x
  3. Step 3: Cross multiply
    128,356.93x = 177,078.31 × 85,929.13
  4. Step 4: Simplify right side
    128,356.93x = 15,216,185,120.17
  5. Step 5: Solve for x
    x = 15,216,185,120.17/128,356.93
  6. Step 6: Final answer
    x = 118,545.88

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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.