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Finding the Fourth Proportional to 1,049.30, 1,448.16 and 769.40

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Solution

The fourth proportional to 1,049.30, 1,448.16 and 769.40 is: 1,061.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,049.30 : 1,448.16 = 769.40 : x
  2. Step 2: Convert to fraction form
    1,049.30/1,448.16 = 769.40/x
  3. Step 3: Cross multiply
    1,049.30x = 1,448.16 × 769.40
  4. Step 4: Simplify right side
    1,049.30x = 1,114,214.30
  5. Step 5: Solve for x
    x = 1,114,214.30/1,049.30
  6. Step 6: Final answer
    x = 1,061.86

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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.