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Finding the Fourth Proportional to 545.71, 818.12 and 515.15

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Solution

The fourth proportional to 545.71, 818.12 and 515.15 is: 772.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    545.71 : 818.12 = 515.15 : x
  2. Step 2: Convert to fraction form
    545.71/818.12 = 515.15/x
  3. Step 3: Cross multiply
    545.71x = 818.12 × 515.15
  4. Step 4: Simplify right side
    545.71x = 421,449.90
  5. Step 5: Solve for x
    x = 421,449.90/545.71
  6. Step 6: Final answer
    x = 772.30

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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.