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Finding the Fourth Proportional to 399.24, 597.48 and 289.20

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Solution

The fourth proportional to 399.24, 597.48 and 289.20 is: 432.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.24 : 597.48 = 289.20 : x
  2. Step 2: Convert to fraction form
    399.24/597.48 = 289.20/x
  3. Step 3: Cross multiply
    399.24x = 597.48 × 289.20
  4. Step 4: Simplify right side
    399.24x = 172,791.22
  5. Step 5: Solve for x
    x = 172,791.22/399.24
  6. Step 6: Final answer
    x = 432.80

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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.