Home / 1,538.30-2,123.85-949.70

Finding the Fourth Proportional to 1,538.30, 2,123.85 and 949.70

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Solution

The fourth proportional to 1,538.30, 2,123.85 and 949.70 is: 1,311.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,538.30 : 2,123.85 = 949.70 : x
  2. Step 2: Convert to fraction form
    1,538.30/2,123.85 = 949.70/x
  3. Step 3: Cross multiply
    1,538.30x = 2,123.85 × 949.70
  4. Step 4: Simplify right side
    1,538.30x = 2,017,020.35
  5. Step 5: Solve for x
    x = 2,017,020.35/1,538.30
  6. Step 6: Final answer
    x = 1,311.20

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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.