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Finding the Fourth Proportional to 391,383.63, 587,159.13 and 121,505.86

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Solution

The fourth proportional to 391,383.63, 587,159.13 and 121,505.86 is: 182,284.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,383.63 : 587,159.13 = 121,505.86 : x
  2. Step 2: Convert to fraction form
    391,383.63/587,159.13 = 121,505.86/x
  3. Step 3: Cross multiply
    391,383.63x = 587,159.13 × 121,505.86
  4. Step 4: Simplify right side
    391,383.63x = 71,343,275,047.50
  5. Step 5: Solve for x
    x = 71,343,275,047.50/391,383.63
  6. Step 6: Final answer
    x = 182,284.77

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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.