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Finding the Fourth Proportional to 720.54, 993.87 and 425.70

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Solution

The fourth proportional to 720.54, 993.87 and 425.70 is: 587.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    720.54 : 993.87 = 425.70 : x
  2. Step 2: Convert to fraction form
    720.54/993.87 = 425.70/x
  3. Step 3: Cross multiply
    720.54x = 993.87 × 425.70
  4. Step 4: Simplify right side
    720.54x = 423,090.46
  5. Step 5: Solve for x
    x = 423,090.46/720.54
  6. Step 6: Final answer
    x = 587.19

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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.