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Finding the Fourth Proportional to 859.32, 1,287.90 and 371.80

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Solution

The fourth proportional to 859.32, 1,287.90 and 371.80 is: 557.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    859.32 : 1,287.90 = 371.80 : x
  2. Step 2: Convert to fraction form
    859.32/1,287.90 = 371.80/x
  3. Step 3: Cross multiply
    859.32x = 1,287.90 × 371.80
  4. Step 4: Simplify right side
    859.32x = 478,841.22
  5. Step 5: Solve for x
    x = 478,841.22/859.32
  6. Step 6: Final answer
    x = 557.23

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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.