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Finding the Fourth Proportional to 431.74, 647.88 and 239.50

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Solution

The fourth proportional to 431.74, 647.88 and 239.50 is: 359.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    431.74 : 647.88 = 239.50 : x
  2. Step 2: Convert to fraction form
    431.74/647.88 = 239.50/x
  3. Step 3: Cross multiply
    431.74x = 647.88 × 239.50
  4. Step 4: Simplify right side
    431.74x = 155,167.26
  5. Step 5: Solve for x
    x = 155,167.26/431.74
  6. Step 6: Final answer
    x = 359.40

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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.