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Finding the Fourth Proportional to 821.41, 1,127.17 and 747.16

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Solution

The fourth proportional to 821.41, 1,127.17 and 747.16 is: 1,025.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    821.41 : 1,127.17 = 747.16 : x
  2. Step 2: Convert to fraction form
    821.41/1,127.17 = 747.16/x
  3. Step 3: Cross multiply
    821.41x = 1,127.17 × 747.16
  4. Step 4: Simplify right side
    821.41x = 842,176.34
  5. Step 5: Solve for x
    x = 842,176.34/821.41
  6. Step 6: Final answer
    x = 1,025.28

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.