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Finding the Fourth Proportional to 391,285.80, 586,712.43 and 121,339.08

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Solution

The fourth proportional to 391,285.80, 586,712.43 and 121,339.08 is: 181,941.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,285.80 : 586,712.43 = 121,339.08 : x
  2. Step 2: Convert to fraction form
    391,285.80/586,712.43 = 121,339.08/x
  3. Step 3: Cross multiply
    391,285.80x = 586,712.43 × 121,339.08
  4. Step 4: Simplify right side
    391,285.80x = 71,191,146,480.76
  5. Step 5: Solve for x
    x = 71,191,146,480.76/391,285.80
  6. Step 6: Final answer
    x = 181,941.55

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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.