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Finding the Fourth Proportional to 1,376.76, 2,061.62 and 759.78

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Solution

The fourth proportional to 1,376.76, 2,061.62 and 759.78 is: 1,137.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,376.76 : 2,061.62 = 759.78 : x
  2. Step 2: Convert to fraction form
    1,376.76/2,061.62 = 759.78/x
  3. Step 3: Cross multiply
    1,376.76x = 2,061.62 × 759.78
  4. Step 4: Simplify right side
    1,376.76x = 1,566,373.84
  5. Step 5: Solve for x
    x = 1,566,373.84/1,376.76
  6. Step 6: Final answer
    x = 1,137.72

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.