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Finding the Fourth Proportional to 720.64, 994.20 and 472.40

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Solution

The fourth proportional to 720.64, 994.20 and 472.40 is: 651.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    720.64 : 994.20 = 472.40 : x
  2. Step 2: Convert to fraction form
    720.64/994.20 = 472.40/x
  3. Step 3: Cross multiply
    720.64x = 994.20 × 472.40
  4. Step 4: Simplify right side
    720.64x = 469,660.08
  5. Step 5: Solve for x
    x = 469,660.08/720.64
  6. Step 6: Final answer
    x = 651.73

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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.