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Finding the Fourth Proportional to 1,281.95, 1,769.06 and 757.88

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Solution

The fourth proportional to 1,281.95, 1,769.06 and 757.88 is: 1,045.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,281.95 : 1,769.06 = 757.88 : x
  2. Step 2: Convert to fraction form
    1,281.95/1,769.06 = 757.88/x
  3. Step 3: Cross multiply
    1,281.95x = 1,769.06 × 757.88
  4. Step 4: Simplify right side
    1,281.95x = 1,340,728.24
  5. Step 5: Solve for x
    x = 1,340,728.24/1,281.95
  6. Step 6: Final answer
    x = 1,045.85

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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.