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Finding the Fourth Proportional to 391,292.06, 586,721.80 and 121,345.34

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Solution

The fourth proportional to 391,292.06, 586,721.80 and 121,345.34 is: 181,950.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,292.06 : 586,721.80 = 121,345.34 : x
  2. Step 2: Convert to fraction form
    391,292.06/586,721.80 = 121,345.34/x
  3. Step 3: Cross multiply
    391,292.06x = 586,721.80 × 121,345.34
  4. Step 4: Simplify right side
    391,292.06x = 71,195,956,306.41
  5. Step 5: Solve for x
    x = 71,195,956,306.41/391,292.06
  6. Step 6: Final answer
    x = 181,950.94

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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.