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Finding the Fourth Proportional to 720.71, 993.70 and 425.87

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Solution

The fourth proportional to 720.71, 993.70 and 425.87 is: 587.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    720.71 : 993.70 = 425.87 : x
  2. Step 2: Convert to fraction form
    720.71/993.70 = 425.87/x
  3. Step 3: Cross multiply
    720.71x = 993.70 × 425.87
  4. Step 4: Simplify right side
    720.71x = 423,188.44
  5. Step 5: Solve for x
    x = 423,188.44/720.71
  6. Step 6: Final answer
    x = 587.18

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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.