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Finding the Fourth Proportional to 781.46, 1,172.39 and 342.66

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Solution

The fourth proportional to 781.46, 1,172.39 and 342.66 is: 514.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    781.46 : 1,172.39 = 342.66 : x
  2. Step 2: Convert to fraction form
    781.46/1,172.39 = 342.66/x
  3. Step 3: Cross multiply
    781.46x = 1,172.39 × 342.66
  4. Step 4: Simplify right side
    781.46x = 401,731.16
  5. Step 5: Solve for x
    x = 401,731.16/781.46
  6. Step 6: Final answer
    x = 514.08

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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.