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Finding the Fourth Proportional to 720.16, 993.81 and 405.43

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Solution

The fourth proportional to 720.16, 993.81 and 405.43 is: 559.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    720.16 : 993.81 = 405.43 : x
  2. Step 2: Convert to fraction form
    720.16/993.81 = 405.43/x
  3. Step 3: Cross multiply
    720.16x = 993.81 × 405.43
  4. Step 4: Simplify right side
    720.16x = 402,920.39
  5. Step 5: Solve for x
    x = 402,920.39/720.16
  6. Step 6: Final answer
    x = 559.49

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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.