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Finding the Fourth Proportional to 129,681.12, 193,968.72 and 79,638.24

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Solution

The fourth proportional to 129,681.12, 193,968.72 and 79,638.24 is: 119,117.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,681.12 : 193,968.72 = 79,638.24 : x
  2. Step 2: Convert to fraction form
    129,681.12/193,968.72 = 79,638.24/x
  3. Step 3: Cross multiply
    129,681.12x = 193,968.72 × 79,638.24
  4. Step 4: Simplify right side
    129,681.12x = 15,447,327,475.85
  5. Step 5: Solve for x
    x = 15,447,327,475.85/129,681.12
  6. Step 6: Final answer
    x = 119,117.78

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.