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Finding the Fourth Proportional to 128,073.16, 176,724.66 and 71,486.92

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Solution

The fourth proportional to 128,073.16, 176,724.66 and 71,486.92 is: 98,642.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,073.16 : 176,724.66 = 71,486.92 : x
  2. Step 2: Convert to fraction form
    128,073.16/176,724.66 = 71,486.92/x
  3. Step 3: Cross multiply
    128,073.16x = 176,724.66 × 71,486.92
  4. Step 4: Simplify right side
    128,073.16x = 12,633,501,631.45
  5. Step 5: Solve for x
    x = 12,633,501,631.45/128,073.16
  6. Step 6: Final answer
    x = 98,642.85

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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.