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Finding the Fourth Proportional to 666.49, 920.69 and 631.46

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Solution

The fourth proportional to 666.49, 920.69 and 631.46 is: 872.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.49 : 920.69 = 631.46 : x
  2. Step 2: Convert to fraction form
    666.49/920.69 = 631.46/x
  3. Step 3: Cross multiply
    666.49x = 920.69 × 631.46
  4. Step 4: Simplify right side
    666.49x = 581,378.91
  5. Step 5: Solve for x
    x = 581,378.91/666.49
  6. Step 6: Final answer
    x = 872.30

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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.