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Finding the Fourth Proportional to 720.23, 994.88 and 641.86

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Solution

The fourth proportional to 720.23, 994.88 and 641.86 is: 886.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    720.23 : 994.88 = 641.86 : x
  2. Step 2: Convert to fraction form
    720.23/994.88 = 641.86/x
  3. Step 3: Cross multiply
    720.23x = 994.88 × 641.86
  4. Step 4: Simplify right side
    720.23x = 638,572.79
  5. Step 5: Solve for x
    x = 638,572.79/720.23
  6. Step 6: Final answer
    x = 886.63

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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.