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Finding the Fourth Proportional to 100,672.45, 138,924.43 and 55,350.08

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Solution

The fourth proportional to 100,672.45, 138,924.43 and 55,350.08 is: 76,381.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,672.45 : 138,924.43 = 55,350.08 : x
  2. Step 2: Convert to fraction form
    100,672.45/138,924.43 = 55,350.08/x
  3. Step 3: Cross multiply
    100,672.45x = 138,924.43 × 55,350.08
  4. Step 4: Simplify right side
    100,672.45x = 7,689,478,002.42
  5. Step 5: Solve for x
    x = 7,689,478,002.42/100,672.45
  6. Step 6: Final answer
    x = 76,381.16

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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.