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Finding the Fourth Proportional to 971.80, 1,339.13 and 814.46

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Solution

The fourth proportional to 971.80, 1,339.13 and 814.46 is: 1,122.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    971.80 : 1,339.13 = 814.46 : x
  2. Step 2: Convert to fraction form
    971.80/1,339.13 = 814.46/x
  3. Step 3: Cross multiply
    971.80x = 1,339.13 × 814.46
  4. Step 4: Simplify right side
    971.80x = 1,090,663.16
  5. Step 5: Solve for x
    x = 1,090,663.16/971.80
  6. Step 6: Final answer
    x = 1,122.32

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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.