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Finding the Fourth Proportional to 1,876.02, 2,814.78 and 781.14

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Solution

The fourth proportional to 1,876.02, 2,814.78 and 781.14 is: 1,172.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,876.02 : 2,814.78 = 781.14 : x
  2. Step 2: Convert to fraction form
    1,876.02/2,814.78 = 781.14/x
  3. Step 3: Cross multiply
    1,876.02x = 2,814.78 × 781.14
  4. Step 4: Simplify right side
    1,876.02x = 2,198,737.25
  5. Step 5: Solve for x
    x = 2,198,737.25/1,876.02
  6. Step 6: Final answer
    x = 1,172.02

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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.