Home / 128,961.52-177,966.90-72,372.88

Finding the Fourth Proportional to 128,961.52, 177,966.90 and 72,372.88

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Solution

The fourth proportional to 128,961.52, 177,966.90 and 72,372.88 is: 99,874.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,961.52 : 177,966.90 = 72,372.88 : x
  2. Step 2: Convert to fraction form
    128,961.52/177,966.90 = 72,372.88/x
  3. Step 3: Cross multiply
    128,961.52x = 177,966.90 × 72,372.88
  4. Step 4: Simplify right side
    128,961.52x = 12,879,977,097.67
  5. Step 5: Solve for x
    x = 12,879,977,097.67/128,961.52
  6. Step 6: Final answer
    x = 99,874.58

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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.