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Finding the Fourth Proportional to 1,280.84, 1,767.56 and 756.90

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Solution

The fourth proportional to 1,280.84, 1,767.56 and 756.90 is: 1,044.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,280.84 : 1,767.56 = 756.90 : x
  2. Step 2: Convert to fraction form
    1,280.84/1,767.56 = 756.90/x
  3. Step 3: Cross multiply
    1,280.84x = 1,767.56 × 756.90
  4. Step 4: Simplify right side
    1,280.84x = 1,337,862.38
  5. Step 5: Solve for x
    x = 1,337,862.38/1,280.84
  6. Step 6: Final answer
    x = 1,044.52

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1.5x scale

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.