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Finding the Fourth Proportional to 719.52, 1,079.46 and 286.80

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Solution

The fourth proportional to 719.52, 1,079.46 and 286.80 is: 430.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    719.52 : 1,079.46 = 286.80 : x
  2. Step 2: Convert to fraction form
    719.52/1,079.46 = 286.80/x
  3. Step 3: Cross multiply
    719.52x = 1,079.46 × 286.80
  4. Step 4: Simplify right side
    719.52x = 309,589.13
  5. Step 5: Solve for x
    x = 309,589.13/719.52
  6. Step 6: Final answer
    x = 430.27

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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.