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Finding the Fourth Proportional to 391,625.76, 587,394.80 and 138,885.04

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Solution

The fourth proportional to 391,625.76, 587,394.80 and 138,885.04 is: 208,312.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,625.76 : 587,394.80 = 138,885.04 : x
  2. Step 2: Convert to fraction form
    391,625.76/587,394.80 = 138,885.04/x
  3. Step 3: Cross multiply
    391,625.76x = 587,394.80 × 138,885.04
  4. Step 4: Simplify right side
    391,625.76x = 81,580,350,293.79
  5. Step 5: Solve for x
    x = 81,580,350,293.79/391,625.76
  6. Step 6: Final answer
    x = 208,312.01

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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.