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Finding the Fourth Proportional to 720.66, 1,080.36 and 287.53

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Solution

The fourth proportional to 720.66, 1,080.36 and 287.53 is: 431.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    720.66 : 1,080.36 = 287.53 : x
  2. Step 2: Convert to fraction form
    720.66/1,080.36 = 287.53/x
  3. Step 3: Cross multiply
    720.66x = 1,080.36 × 287.53
  4. Step 4: Simplify right side
    720.66x = 310,635.91
  5. Step 5: Solve for x
    x = 310,635.91/720.66
  6. Step 6: Final answer
    x = 431.04

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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.