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Finding the Fourth Proportional to 832.40, 1,248.60 and 399.45

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Solution

The fourth proportional to 832.40, 1,248.60 and 399.45 is: 599.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    832.40 : 1,248.60 = 399.45 : x
  2. Step 2: Convert to fraction form
    832.40/1,248.60 = 399.45/x
  3. Step 3: Cross multiply
    832.40x = 1,248.60 × 399.45
  4. Step 4: Simplify right side
    832.40x = 498,753.27
  5. Step 5: Solve for x
    x = 498,753.27/832.40
  6. Step 6: Final answer
    x = 599.18

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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.