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Finding the Fourth Proportional to 523.65, 720.98 and 398.91

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Solution

The fourth proportional to 523.65, 720.98 and 398.91 is: 549.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    523.65 : 720.98 = 398.91 : x
  2. Step 2: Convert to fraction form
    523.65/720.98 = 398.91/x
  3. Step 3: Cross multiply
    523.65x = 720.98 × 398.91
  4. Step 4: Simplify right side
    523.65x = 287,600.53
  5. Step 5: Solve for x
    x = 287,600.53/523.65
  6. Step 6: Final answer
    x = 549.23

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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.