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Finding the Fourth Proportional to 859.56, 1,287.33 and 627.87

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Solution

The fourth proportional to 859.56, 1,287.33 and 627.87 is: 940.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    859.56 : 1,287.33 = 627.87 : x
  2. Step 2: Convert to fraction form
    859.56/1,287.33 = 627.87/x
  3. Step 3: Cross multiply
    859.56x = 1,287.33 × 627.87
  4. Step 4: Simplify right side
    859.56x = 808,275.89
  5. Step 5: Solve for x
    x = 808,275.89/859.56
  6. Step 6: Final answer
    x = 940.34

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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.