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Finding the Fourth Proportional to 92,000.70, 138,001.05 and 77,129.10

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Solution

The fourth proportional to 92,000.70, 138,001.05 and 77,129.10 is: 115,693.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    92,000.70 : 138,001.05 = 77,129.10 : x
  2. Step 2: Convert to fraction form
    92,000.70/138,001.05 = 77,129.10/x
  3. Step 3: Cross multiply
    92,000.70x = 138,001.05 × 77,129.10
  4. Step 4: Simplify right side
    92,000.70x = 10,643,896,785.56
  5. Step 5: Solve for x
    x = 10,643,896,785.56/92,000.70
  6. Step 6: Final answer
    x = 115,693.65

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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.