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Finding the Fourth Proportional to 720.18, 993.90 and 401.17

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Solution

The fourth proportional to 720.18, 993.90 and 401.17 is: 553.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    720.18 : 993.90 = 401.17 : x
  2. Step 2: Convert to fraction form
    720.18/993.90 = 401.17/x
  3. Step 3: Cross multiply
    720.18x = 993.90 × 401.17
  4. Step 4: Simplify right side
    720.18x = 398,722.86
  5. Step 5: Solve for x
    x = 398,722.86/720.18
  6. Step 6: Final answer
    x = 553.64

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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.