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Finding the Fourth Proportional to 720.18, 993.88 and 425.44

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Solution

The fourth proportional to 720.18, 993.88 and 425.44 is: 587.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    720.18 : 993.88 = 425.44 : x
  2. Step 2: Convert to fraction form
    720.18/993.88 = 425.44/x
  3. Step 3: Cross multiply
    720.18x = 993.88 × 425.44
  4. Step 4: Simplify right side
    720.18x = 422,836.31
  5. Step 5: Solve for x
    x = 422,836.31/720.18
  6. Step 6: Final answer
    x = 587.13

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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.