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Finding the Fourth Proportional to 720.33, 994.05 and 405.60

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Solution

The fourth proportional to 720.33, 994.05 and 405.60 is: 559.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    720.33 : 994.05 = 405.60 : x
  2. Step 2: Convert to fraction form
    720.33/994.05 = 405.60/x
  3. Step 3: Cross multiply
    720.33x = 994.05 × 405.60
  4. Step 4: Simplify right side
    720.33x = 403,184.61
  5. Step 5: Solve for x
    x = 403,184.61/720.33
  6. Step 6: Final answer
    x = 559.72

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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.