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Finding the Fourth Proportional to 1,123.09, 1,549.86 and 625.70

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Solution

The fourth proportional to 1,123.09, 1,549.86 and 625.70 is: 863.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,123.09 : 1,549.86 = 625.70 : x
  2. Step 2: Convert to fraction form
    1,123.09/1,549.86 = 625.70/x
  3. Step 3: Cross multiply
    1,123.09x = 1,549.86 × 625.70
  4. Step 4: Simplify right side
    1,123.09x = 969,747.40
  5. Step 5: Solve for x
    x = 969,747.40/1,123.09
  6. Step 6: Final answer
    x = 863.46

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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.