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Finding the Fourth Proportional to 100,555.91, 138,789.26 and 69,554.76

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Solution

The fourth proportional to 100,555.91, 138,789.26 and 69,554.76 is: 96,000.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,555.91 : 138,789.26 = 69,554.76 : x
  2. Step 2: Convert to fraction form
    100,555.91/138,789.26 = 69,554.76/x
  3. Step 3: Cross multiply
    100,555.91x = 138,789.26 × 69,554.76
  4. Step 4: Simplify right side
    100,555.91x = 9,653,454,136.15
  5. Step 5: Solve for x
    x = 9,653,454,136.15/100,555.91
  6. Step 6: Final answer
    x = 96,000.87

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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.