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Finding the Fourth Proportional to 971.13, 1,340.11 and 551.43

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Solution

The fourth proportional to 971.13, 1,340.11 and 551.43 is: 760.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    971.13 : 1,340.11 = 551.43 : x
  2. Step 2: Convert to fraction form
    971.13/1,340.11 = 551.43/x
  3. Step 3: Cross multiply
    971.13x = 1,340.11 × 551.43
  4. Step 4: Simplify right side
    971.13x = 738,976.86
  5. Step 5: Solve for x
    x = 738,976.86/971.13
  6. Step 6: Final answer
    x = 760.95

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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.