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Finding the Fourth Proportional to 520.91, 718.87 and 355.19

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Solution

The fourth proportional to 520.91, 718.87 and 355.19 is: 490.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    520.91 : 718.87 = 355.19 : x
  2. Step 2: Convert to fraction form
    520.91/718.87 = 355.19/x
  3. Step 3: Cross multiply
    520.91x = 718.87 × 355.19
  4. Step 4: Simplify right side
    520.91x = 255,336.34
  5. Step 5: Solve for x
    x = 255,336.34/520.91
  6. Step 6: Final answer
    x = 490.18

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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.