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Finding the Fourth Proportional to 391,018.61, 586,591.19 and 121,083.30

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Solution

The fourth proportional to 391,018.61, 586,591.19 and 121,083.30 is: 181,644.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,018.61 : 586,591.19 = 121,083.30 : x
  2. Step 2: Convert to fraction form
    391,018.61/586,591.19 = 121,083.30/x
  3. Step 3: Cross multiply
    391,018.61x = 586,591.19 × 121,083.30
  4. Step 4: Simplify right side
    391,018.61x = 71,026,396,430.71
  5. Step 5: Solve for x
    x = 71,026,396,430.71/391,018.61
  6. Step 6: Final answer
    x = 181,644.54

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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.