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Finding the Fourth Proportional to 663.49, 921.61 and 652.89

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Solution

The fourth proportional to 663.49, 921.61 and 652.89 is: 906.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    663.49 : 921.61 = 652.89 : x
  2. Step 2: Convert to fraction form
    663.49/921.61 = 652.89/x
  3. Step 3: Cross multiply
    663.49x = 921.61 × 652.89
  4. Step 4: Simplify right side
    663.49x = 601,713.89
  5. Step 5: Solve for x
    x = 601,713.89/663.49
  6. Step 6: Final answer
    x = 906.90

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.