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Finding the Fourth Proportional to 781.89, 1,172.72 and 348.95

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Solution

The fourth proportional to 781.89, 1,172.72 and 348.95 is: 523.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    781.89 : 1,172.72 = 348.95 : x
  2. Step 2: Convert to fraction form
    781.89/1,172.72 = 348.95/x
  3. Step 3: Cross multiply
    781.89x = 1,172.72 × 348.95
  4. Step 4: Simplify right side
    781.89x = 409,213.04
  5. Step 5: Solve for x
    x = 409,213.04/781.89
  6. Step 6: Final answer
    x = 523.36

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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.