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Finding the Fourth Proportional to 128,705.17, 177,613.19 and 78,404.17

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Solution

The fourth proportional to 128,705.17, 177,613.19 and 78,404.17 is: 108,197.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,705.17 : 177,613.19 = 78,404.17 : x
  2. Step 2: Convert to fraction form
    128,705.17/177,613.19 = 78,404.17/x
  3. Step 3: Cross multiply
    128,705.17x = 177,613.19 × 78,404.17
  4. Step 4: Simplify right side
    128,705.17x = 13,925,614,743.00
  5. Step 5: Solve for x
    x = 13,925,614,743.00/128,705.17
  6. Step 6: Final answer
    x = 108,197.79

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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.