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Finding the Fourth Proportional to 720.14, 1,080.52 and 287.18

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Solution

The fourth proportional to 720.14, 1,080.52 and 287.18 is: 430.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    720.14 : 1,080.52 = 287.18 : x
  2. Step 2: Convert to fraction form
    720.14/1,080.52 = 287.18/x
  3. Step 3: Cross multiply
    720.14x = 1,080.52 × 287.18
  4. Step 4: Simplify right side
    720.14x = 310,303.73
  5. Step 5: Solve for x
    x = 310,303.73/720.14
  6. Step 6: Final answer
    x = 430.89

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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.