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Finding the Fourth Proportional to 128,909.92, 177,890.88 and 72,324.40

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Solution

The fourth proportional to 128,909.92, 177,890.88 and 72,324.40 is: 99,804.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,909.92 : 177,890.88 = 72,324.40 : x
  2. Step 2: Convert to fraction form
    128,909.92/177,890.88 = 72,324.40/x
  3. Step 3: Cross multiply
    128,909.92x = 177,890.88 × 72,324.40
  4. Step 4: Simplify right side
    128,909.92x = 12,865,851,161.47
  5. Step 5: Solve for x
    x = 12,865,851,161.47/128,909.92
  6. Step 6: Final answer
    x = 99,804.97

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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.