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Finding the Fourth Proportional to 391,141.60, 586,778.40 and 121,207.60

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Solution

The fourth proportional to 391,141.60, 586,778.40 and 121,207.60 is: 181,831.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,141.60 : 586,778.40 = 121,207.60 : x
  2. Step 2: Convert to fraction form
    391,141.60/586,778.40 = 121,207.60/x
  3. Step 3: Cross multiply
    391,141.60x = 586,778.40 × 121,207.60
  4. Step 4: Simplify right side
    391,141.60x = 71,122,001,595.84
  5. Step 5: Solve for x
    x = 71,122,001,595.84/391,141.60
  6. Step 6: Final answer
    x = 181,831.85

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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.