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Finding the Fourth Proportional to 840.43, 1,260.46 and 531.87

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Solution

The fourth proportional to 840.43, 1,260.46 and 531.87 is: 797.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    840.43 : 1,260.46 = 531.87 : x
  2. Step 2: Convert to fraction form
    840.43/1,260.46 = 531.87/x
  3. Step 3: Cross multiply
    840.43x = 1,260.46 × 531.87
  4. Step 4: Simplify right side
    840.43x = 670,396.80
  5. Step 5: Solve for x
    x = 670,396.80/840.43
  6. Step 6: Final answer
    x = 797.69

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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.