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Finding the Fourth Proportional to 668.46, 921.98 and 521.04

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Solution

The fourth proportional to 668.46, 921.98 and 521.04 is: 718.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    668.46 : 921.98 = 521.04 : x
  2. Step 2: Convert to fraction form
    668.46/921.98 = 521.04/x
  3. Step 3: Cross multiply
    668.46x = 921.98 × 521.04
  4. Step 4: Simplify right side
    668.46x = 480,388.46
  5. Step 5: Solve for x
    x = 480,388.46/668.46
  6. Step 6: Final answer
    x = 718.65

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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.