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Finding the Fourth Proportional to 1,878.24, 2,816.50 and 781.95

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Solution

The fourth proportional to 1,878.24, 2,816.50 and 781.95 is: 1,172.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,878.24 : 2,816.50 = 781.95 : x
  2. Step 2: Convert to fraction form
    1,878.24/2,816.50 = 781.95/x
  3. Step 3: Cross multiply
    1,878.24x = 2,816.50 × 781.95
  4. Step 4: Simplify right side
    1,878.24x = 2,202,344.18
  5. Step 5: Solve for x
    x = 2,202,344.18/1,878.24
  6. Step 6: Final answer
    x = 1,172.56

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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.