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Finding the Fourth Proportional to 720.48, 994.20 and 440.64

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Solution

The fourth proportional to 720.48, 994.20 and 440.64 is: 608.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    720.48 : 994.20 = 440.64 : x
  2. Step 2: Convert to fraction form
    720.48/994.20 = 440.64/x
  3. Step 3: Cross multiply
    720.48x = 994.20 × 440.64
  4. Step 4: Simplify right side
    720.48x = 438,084.29
  5. Step 5: Solve for x
    x = 438,084.29/720.48
  6. Step 6: Final answer
    x = 608.05

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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.