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Finding the Fourth Proportional to 2,630.40, 3,945.03 and 781.53

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Solution

The fourth proportional to 2,630.40, 3,945.03 and 781.53 is: 1,172.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,630.40 : 3,945.03 = 781.53 : x
  2. Step 2: Convert to fraction form
    2,630.40/3,945.03 = 781.53/x
  3. Step 3: Cross multiply
    2,630.40x = 3,945.03 × 781.53
  4. Step 4: Simplify right side
    2,630.40x = 3,083,157.64
  5. Step 5: Solve for x
    x = 3,083,157.64/2,630.40
  6. Step 6: Final answer
    x = 1,172.13

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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.