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Finding the Fourth Proportional to 431.52, 646.24 and 239.04

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Solution

The fourth proportional to 431.52, 646.24 and 239.04 is: 357.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    431.52 : 646.24 = 239.04 : x
  2. Step 2: Convert to fraction form
    431.52/646.24 = 239.04/x
  3. Step 3: Cross multiply
    431.52x = 646.24 × 239.04
  4. Step 4: Simplify right side
    431.52x = 154,477.21
  5. Step 5: Solve for x
    x = 154,477.21/431.52
  6. Step 6: Final answer
    x = 357.98

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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.