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Finding the Fourth Proportional to 391,983,870.78, 587,975,806.04 and 146,359,687.59

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Solution

The fourth proportional to 391,983,870.78, 587,975,806.04 and 146,359,687.59 is: 219,539,531.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,983,870.78 : 587,975,806.04 = 146,359,687.59 : x
  2. Step 2: Convert to fraction form
    391,983,870.78/587,975,806.04 = 146,359,687.59/x
  3. Step 3: Cross multiply
    391,983,870.78x = 587,975,806.04 × 146,359,687.59
  4. Step 4: Simplify right side
    391,983,870.78x = 86,055,955,281,761,040
  5. Step 5: Solve for x
    x = 86,055,955,281,761,040/391,983,870.78
  6. Step 6: Final answer
    x = 219,539,531.33

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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.