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Finding the Fourth Proportional to 128,649, 177,535.62 and 72,060.24

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Solution

The fourth proportional to 128,649, 177,535.62 and 72,060.24 is: 99,443.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,649 : 177,535.62 = 72,060.24 : x
  2. Step 2: Convert to fraction form
    128,649/177,535.62 = 72,060.24/x
  3. Step 3: Cross multiply
    128,649x = 177,535.62 × 72,060.24
  4. Step 4: Simplify right side
    128,649x = 12,793,259,385.75
  5. Step 5: Solve for x
    x = 12,793,259,385.75/128,649
  6. Step 6: Final answer
    x = 99,443.13

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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.