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Finding the Fourth Proportional to 520.29, 718.12 and 354.90

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Solution

The fourth proportional to 520.29, 718.12 and 354.90 is: 489.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    520.29 : 718.12 = 354.90 : x
  2. Step 2: Convert to fraction form
    520.29/718.12 = 354.90/x
  3. Step 3: Cross multiply
    520.29x = 718.12 × 354.90
  4. Step 4: Simplify right side
    520.29x = 254,860.79
  5. Step 5: Solve for x
    x = 254,860.79/520.29
  6. Step 6: Final answer
    x = 489.84

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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.