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Finding the Fourth Proportional to 781.94, 1,172.98 and 261.95

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Solution

The fourth proportional to 781.94, 1,172.98 and 261.95 is: 392.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    781.94 : 1,172.98 = 261.95 : x
  2. Step 2: Convert to fraction form
    781.94/1,172.98 = 261.95/x
  3. Step 3: Cross multiply
    781.94x = 1,172.98 × 261.95
  4. Step 4: Simplify right side
    781.94x = 307,262.11
  5. Step 5: Solve for x
    x = 307,262.11/781.94
  6. Step 6: Final answer
    x = 392.95

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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.