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Finding the Fourth Proportional to 100,423.01, 138,584.25 and 55,105.13

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Solution

The fourth proportional to 100,423.01, 138,584.25 and 55,105.13 is: 76,045.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,423.01 : 138,584.25 = 55,105.13 : x
  2. Step 2: Convert to fraction form
    100,423.01/138,584.25 = 55,105.13/x
  3. Step 3: Cross multiply
    100,423.01x = 138,584.25 × 55,105.13
  4. Step 4: Simplify right side
    100,423.01x = 7,636,702,419.28
  5. Step 5: Solve for x
    x = 7,636,702,419.28/100,423.01
  6. Step 6: Final answer
    x = 76,045.35

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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.