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Finding the Fourth Proportional to 1,277.91, 1,763.47 and 781.38

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Solution

The fourth proportional to 1,277.91, 1,763.47 and 781.38 is: 1,078.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,277.91 : 1,763.47 = 781.38 : x
  2. Step 2: Convert to fraction form
    1,277.91/1,763.47 = 781.38/x
  3. Step 3: Cross multiply
    1,277.91x = 1,763.47 × 781.38
  4. Step 4: Simplify right side
    1,277.91x = 1,377,941.17
  5. Step 5: Solve for x
    x = 1,377,941.17/1,277.91
  6. Step 6: Final answer
    x = 1,078.28

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Double scale
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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.