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Finding the Fourth Proportional to 100,423.50, 138,585.72 and 55,098.60

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Solution

The fourth proportional to 100,423.50, 138,585.72 and 55,098.60 is: 76,036.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,423.50 : 138,585.72 = 55,098.60 : x
  2. Step 2: Convert to fraction form
    100,423.50/138,585.72 = 55,098.60/x
  3. Step 3: Cross multiply
    100,423.50x = 138,585.72 × 55,098.60
  4. Step 4: Simplify right side
    100,423.50x = 7,635,879,151.99
  5. Step 5: Solve for x
    x = 7,635,879,151.99/100,423.50
  6. Step 6: Final answer
    x = 76,036.78

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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.