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Finding the Fourth Proportional to 520.20, 718.72 and 515.08

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Solution

The fourth proportional to 520.20, 718.72 and 515.08 is: 711.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    520.20 : 718.72 = 515.08 : x
  2. Step 2: Convert to fraction form
    520.20/718.72 = 515.08/x
  3. Step 3: Cross multiply
    520.20x = 718.72 × 515.08
  4. Step 4: Simplify right side
    520.20x = 370,198.30
  5. Step 5: Solve for x
    x = 370,198.30/520.20
  6. Step 6: Final answer
    x = 711.65

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.