Home / 128,631.62-177,514.08-72,042.86

Finding the Fourth Proportional to 128,631.62, 177,514.08 and 72,042.86

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Solution

The fourth proportional to 128,631.62, 177,514.08 and 72,042.86 is: 99,420.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,631.62 : 177,514.08 = 72,042.86 : x
  2. Step 2: Convert to fraction form
    128,631.62/177,514.08 = 72,042.86/x
  3. Step 3: Cross multiply
    128,631.62x = 177,514.08 × 72,042.86
  4. Step 4: Simplify right side
    128,631.62x = 12,788,622,013.47
  5. Step 5: Solve for x
    x = 12,788,622,013.47/128,631.62
  6. Step 6: Final answer
    x = 99,420.52

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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.