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Finding the Fourth Proportional to 1,122.80, 1,549.54 and 625.44

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Solution

The fourth proportional to 1,122.80, 1,549.54 and 625.44 is: 863.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,122.80 : 1,549.54 = 625.44 : x
  2. Step 2: Convert to fraction form
    1,122.80/1,549.54 = 625.44/x
  3. Step 3: Cross multiply
    1,122.80x = 1,549.54 × 625.44
  4. Step 4: Simplify right side
    1,122.80x = 969,150.71
  5. Step 5: Solve for x
    x = 969,150.71/1,122.80
  6. Step 6: Final answer
    x = 863.15

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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.