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Finding the Fourth Proportional to 690.92, 1,031.33 and 608.91

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Solution

The fourth proportional to 690.92, 1,031.33 and 608.91 is: 908.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    690.92 : 1,031.33 = 608.91 : x
  2. Step 2: Convert to fraction form
    690.92/1,031.33 = 608.91/x
  3. Step 3: Cross multiply
    690.92x = 1,031.33 × 608.91
  4. Step 4: Simplify right side
    690.92x = 627,984.11
  5. Step 5: Solve for x
    x = 627,984.11/690.92
  6. Step 6: Final answer
    x = 908.91

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.