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Finding the Fourth Proportional to 720.54, 994.29 and 405.77

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Solution

The fourth proportional to 720.54, 994.29 and 405.77 is: 559.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    720.54 : 994.29 = 405.77 : x
  2. Step 2: Convert to fraction form
    720.54/994.29 = 405.77/x
  3. Step 3: Cross multiply
    720.54x = 994.29 × 405.77
  4. Step 4: Simplify right side
    720.54x = 403,448.08
  5. Step 5: Solve for x
    x = 403,448.08/720.54
  6. Step 6: Final answer
    x = 559.92

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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.