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Finding the Fourth Proportional to 128,740.32, 177,658.92 and 72,150.48

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Solution

The fourth proportional to 128,740.32, 177,658.92 and 72,150.48 is: 99,566.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,740.32 : 177,658.92 = 72,150.48 : x
  2. Step 2: Convert to fraction form
    128,740.32/177,658.92 = 72,150.48/x
  3. Step 3: Cross multiply
    128,740.32x = 177,658.92 × 72,150.48
  4. Step 4: Simplify right side
    128,740.32x = 12,818,176,354.28
  5. Step 5: Solve for x
    x = 12,818,176,354.28/128,740.32
  6. Step 6: Final answer
    x = 99,566.14

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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.