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Finding the Fourth Proportional to 908.49, 1,252.38 and 642.11

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Solution

The fourth proportional to 908.49, 1,252.38 and 642.11 is: 885.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    908.49 : 1,252.38 = 642.11 : x
  2. Step 2: Convert to fraction form
    908.49/1,252.38 = 642.11/x
  3. Step 3: Cross multiply
    908.49x = 1,252.38 × 642.11
  4. Step 4: Simplify right side
    908.49x = 804,159.46
  5. Step 5: Solve for x
    x = 804,159.46/908.49
  6. Step 6: Final answer
    x = 885.16

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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.