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Finding the Fourth Proportional to 126,415.62, 174,488.31 and 78,640.47

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Solution

The fourth proportional to 126,415.62, 174,488.31 and 78,640.47 is: 108,545.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    126,415.62 : 174,488.31 = 78,640.47 : x
  2. Step 2: Convert to fraction form
    126,415.62/174,488.31 = 78,640.47/x
  3. Step 3: Cross multiply
    126,415.62x = 174,488.31 × 78,640.47
  4. Step 4: Simplify right side
    126,415.62x = 13,721,842,707.91
  5. Step 5: Solve for x
    x = 13,721,842,707.91/126,415.62
  6. Step 6: Final answer
    x = 108,545.47

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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.