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Finding the Fourth Proportional to 724.64, 997.80 and 642.08

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Solution

The fourth proportional to 724.64, 997.80 and 642.08 is: 884.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    724.64 : 997.80 = 642.08 : x
  2. Step 2: Convert to fraction form
    724.64/997.80 = 642.08/x
  3. Step 3: Cross multiply
    724.64x = 997.80 × 642.08
  4. Step 4: Simplify right side
    724.64x = 640,667.42
  5. Step 5: Solve for x
    x = 640,667.42/724.64
  6. Step 6: Final answer
    x = 884.12

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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.