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Finding the Fourth Proportional to 391,510.80, 587,266.20 and 265,211.55

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Solution

The fourth proportional to 391,510.80, 587,266.20 and 265,211.55 is: 397,817.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,510.80 : 587,266.20 = 265,211.55 : x
  2. Step 2: Convert to fraction form
    391,510.80/587,266.20 = 265,211.55/x
  3. Step 3: Cross multiply
    391,510.80x = 587,266.20 × 265,211.55
  4. Step 4: Simplify right side
    391,510.80x = 155,749,779,164.61
  5. Step 5: Solve for x
    x = 155,749,779,164.61/391,510.80
  6. Step 6: Final answer
    x = 397,817.33

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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.