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Finding the Fourth Proportional to 723.42, 999.55 and 644.04

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Solution

The fourth proportional to 723.42, 999.55 and 644.04 is: 889.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    723.42 : 999.55 = 644.04 : x
  2. Step 2: Convert to fraction form
    723.42/999.55 = 644.04/x
  3. Step 3: Cross multiply
    723.42x = 999.55 × 644.04
  4. Step 4: Simplify right side
    723.42x = 643,750.18
  5. Step 5: Solve for x
    x = 643,750.18/723.42
  6. Step 6: Final answer
    x = 889.87

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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.