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Finding the Fourth Proportional to 391,333.05, 587,262.60 and 138,612.63

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Solution

The fourth proportional to 391,333.05, 587,262.60 and 138,612.63 is: 208,012.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,333.05 : 587,262.60 = 138,612.63 : x
  2. Step 2: Convert to fraction form
    391,333.05/587,262.60 = 138,612.63/x
  3. Step 3: Cross multiply
    391,333.05x = 587,262.60 × 138,612.63
  4. Step 4: Simplify right side
    391,333.05x = 81,402,013,486.64
  5. Step 5: Solve for x
    x = 81,402,013,486.64/391,333.05
  6. Step 6: Final answer
    x = 208,012.11

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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.