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Finding the Fourth Proportional to 971.20, 1,339.92 and 551.50

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Solution

The fourth proportional to 971.20, 1,339.92 and 551.50 is: 760.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    971.20 : 1,339.92 = 551.50 : x
  2. Step 2: Convert to fraction form
    971.20/1,339.92 = 551.50/x
  3. Step 3: Cross multiply
    971.20x = 1,339.92 × 551.50
  4. Step 4: Simplify right side
    971.20x = 738,965.88
  5. Step 5: Solve for x
    x = 738,965.88/971.20
  6. Step 6: Final answer
    x = 760.88

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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.