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Finding the Fourth Proportional to 668.40, 921.88 and 580.72

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Solution

The fourth proportional to 668.40, 921.88 and 580.72 is: 800.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    668.40 : 921.88 = 580.72 : x
  2. Step 2: Convert to fraction form
    668.40/921.88 = 580.72/x
  3. Step 3: Cross multiply
    668.40x = 921.88 × 580.72
  4. Step 4: Simplify right side
    668.40x = 535,354.15
  5. Step 5: Solve for x
    x = 535,354.15/668.40
  6. Step 6: Final answer
    x = 800.95

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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.