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Finding the Fourth Proportional to 128,706.92, 177,418.66 and 90,358.89

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Solution

The fourth proportional to 128,706.92, 177,418.66 and 90,358.89 is: 124,557.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,706.92 : 177,418.66 = 90,358.89 : x
  2. Step 2: Convert to fraction form
    128,706.92/177,418.66 = 90,358.89/x
  3. Step 3: Cross multiply
    128,706.92x = 177,418.66 × 90,358.89
  4. Step 4: Simplify right side
    128,706.92x = 16,031,352,069.90
  5. Step 5: Solve for x
    x = 16,031,352,069.90/128,706.92
  6. Step 6: Final answer
    x = 124,557.04

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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.