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Finding the Fourth Proportional to 2,513.80, 3,770.16 and 781.48

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Solution

The fourth proportional to 2,513.80, 3,770.16 and 781.48 is: 1,172.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,513.80 : 3,770.16 = 781.48 : x
  2. Step 2: Convert to fraction form
    2,513.80/3,770.16 = 781.48/x
  3. Step 3: Cross multiply
    2,513.80x = 3,770.16 × 781.48
  4. Step 4: Simplify right side
    2,513.80x = 2,946,304.64
  5. Step 5: Solve for x
    x = 2,946,304.64/2,513.80
  6. Step 6: Final answer
    x = 1,172.05

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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.