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Finding the Fourth Proportional to 832.24, 1,247.40 and 398.80

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Solution

The fourth proportional to 832.24, 1,247.40 and 398.80 is: 597.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    832.24 : 1,247.40 = 398.80 : x
  2. Step 2: Convert to fraction form
    832.24/1,247.40 = 398.80/x
  3. Step 3: Cross multiply
    832.24x = 1,247.40 × 398.80
  4. Step 4: Simplify right side
    832.24x = 497,463.12
  5. Step 5: Solve for x
    x = 497,463.12/832.24
  6. Step 6: Final answer
    x = 597.74

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.