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Finding the Fourth Proportional to 520.86, 718.21 and 355.17

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Solution

The fourth proportional to 520.86, 718.21 and 355.17 is: 489.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    520.86 : 718.21 = 355.17 : x
  2. Step 2: Convert to fraction form
    520.86/718.21 = 355.17/x
  3. Step 3: Cross multiply
    520.86x = 718.21 × 355.17
  4. Step 4: Simplify right side
    520.86x = 255,086.65
  5. Step 5: Solve for x
    x = 255,086.65/520.86
  6. Step 6: Final answer
    x = 489.74

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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.