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Finding the Fourth Proportional to 720.46, 994.28 and 405.70

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Solution

The fourth proportional to 720.46, 994.28 and 405.70 is: 559.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    720.46 : 994.28 = 405.70 : x
  2. Step 2: Convert to fraction form
    720.46/994.28 = 405.70/x
  3. Step 3: Cross multiply
    720.46x = 994.28 × 405.70
  4. Step 4: Simplify right side
    720.46x = 403,374.42
  5. Step 5: Solve for x
    x = 403,374.42/720.46
  6. Step 6: Final answer
    x = 559.88

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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.