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Finding the Fourth Proportional to 399.03, 549.90 and 282.39

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Solution

The fourth proportional to 399.03, 549.90 and 282.39 is: 389.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.03 : 549.90 = 282.39 : x
  2. Step 2: Convert to fraction form
    399.03/549.90 = 282.39/x
  3. Step 3: Cross multiply
    399.03x = 549.90 × 282.39
  4. Step 4: Simplify right side
    399.03x = 155,286.26
  5. Step 5: Solve for x
    x = 155,286.26/399.03
  6. Step 6: Final answer
    x = 389.16

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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.