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Finding the Fourth Proportional to 908.04, 1,253.47 and 687.06

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Solution

The fourth proportional to 908.04, 1,253.47 and 687.06 is: 948.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    908.04 : 1,253.47 = 687.06 : x
  2. Step 2: Convert to fraction form
    908.04/1,253.47 = 687.06/x
  3. Step 3: Cross multiply
    908.04x = 1,253.47 × 687.06
  4. Step 4: Simplify right side
    908.04x = 861,209.10
  5. Step 5: Solve for x
    x = 861,209.10/908.04
  6. Step 6: Final answer
    x = 948.43

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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.