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Finding the Fourth Proportional to 718.91, 1,080.16 and 459.03

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Solution

The fourth proportional to 718.91, 1,080.16 and 459.03 is: 689.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.91 : 1,080.16 = 459.03 : x
  2. Step 2: Convert to fraction form
    718.91/1,080.16 = 459.03/x
  3. Step 3: Cross multiply
    718.91x = 1,080.16 × 459.03
  4. Step 4: Simplify right side
    718.91x = 495,825.84
  5. Step 5: Solve for x
    x = 495,825.84/718.91
  6. Step 6: Final answer
    x = 689.69

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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.