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Finding the Fourth Proportional to 720.47, 994.34 and 405.75

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Solution

The fourth proportional to 720.47, 994.34 and 405.75 is: 559.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    720.47 : 994.34 = 405.75 : x
  2. Step 2: Convert to fraction form
    720.47/994.34 = 405.75/x
  3. Step 3: Cross multiply
    720.47x = 994.34 × 405.75
  4. Step 4: Simplify right side
    720.47x = 403,453.46
  5. Step 5: Solve for x
    x = 403,453.46/720.47
  6. Step 6: Final answer
    x = 559.99

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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.