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Finding the Fourth Proportional to 1,122.81, 1,549.33 and 625.39

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Solution

The fourth proportional to 1,122.81, 1,549.33 and 625.39 is: 862.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,122.81 : 1,549.33 = 625.39 : x
  2. Step 2: Convert to fraction form
    1,122.81/1,549.33 = 625.39/x
  3. Step 3: Cross multiply
    1,122.81x = 1,549.33 × 625.39
  4. Step 4: Simplify right side
    1,122.81x = 968,935.49
  5. Step 5: Solve for x
    x = 968,935.49/1,122.81
  6. Step 6: Final answer
    x = 862.96

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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.