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Finding the Fourth Proportional to 415,572.12, 623,393.55 and 131,186.59

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Solution

The fourth proportional to 415,572.12, 623,393.55 and 131,186.59 is: 196,791.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    415,572.12 : 623,393.55 = 131,186.59 : x
  2. Step 2: Convert to fraction form
    415,572.12/623,393.55 = 131,186.59/x
  3. Step 3: Cross multiply
    415,572.12x = 623,393.55 × 131,186.59
  4. Step 4: Simplify right side
    415,572.12x = 81,780,872,494.01
  5. Step 5: Solve for x
    x = 81,780,872,494.01/415,572.12
  6. Step 6: Final answer
    x = 196,791.05

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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.