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Finding the Fourth Proportional to 720.25, 1,080.38 and 207.25

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Solution

The fourth proportional to 720.25, 1,080.38 and 207.25 is: 310.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    720.25 : 1,080.38 = 207.25 : x
  2. Step 2: Convert to fraction form
    720.25/1,080.38 = 207.25/x
  3. Step 3: Cross multiply
    720.25x = 1,080.38 × 207.25
  4. Step 4: Simplify right side
    720.25x = 223,908.76
  5. Step 5: Solve for x
    x = 223,908.76/720.25
  6. Step 6: Final answer
    x = 310.88

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.