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Finding the Fourth Proportional to 908.45, 1,252.95 and 768.95

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Solution

The fourth proportional to 908.45, 1,252.95 and 768.95 is: 1,060.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    908.45 : 1,252.95 = 768.95 : x
  2. Step 2: Convert to fraction form
    908.45/1,252.95 = 768.95/x
  3. Step 3: Cross multiply
    908.45x = 1,252.95 × 768.95
  4. Step 4: Simplify right side
    908.45x = 963,455.90
  5. Step 5: Solve for x
    x = 963,455.90/908.45
  6. Step 6: Final answer
    x = 1,060.55

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.