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Finding the Fourth Proportional to 100,295.72, 138,380.08 and 79,008.92

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Solution

The fourth proportional to 100,295.72, 138,380.08 and 79,008.92 is: 109,010.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,295.72 : 138,380.08 = 79,008.92 : x
  2. Step 2: Convert to fraction form
    100,295.72/138,380.08 = 79,008.92/x
  3. Step 3: Cross multiply
    100,295.72x = 138,380.08 × 79,008.92
  4. Step 4: Simplify right side
    100,295.72x = 10,933,260,670.31
  5. Step 5: Solve for x
    x = 10,933,260,670.31/100,295.72
  6. Step 6: Final answer
    x = 109,010.24

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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.