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Finding the Fourth Proportional to 859.52, 1,288.02 and 627.05

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Solution

The fourth proportional to 859.52, 1,288.02 and 627.05 is: 939.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    859.52 : 1,288.02 = 627.05 : x
  2. Step 2: Convert to fraction form
    859.52/1,288.02 = 627.05/x
  3. Step 3: Cross multiply
    859.52x = 1,288.02 × 627.05
  4. Step 4: Simplify right side
    859.52x = 807,652.94
  5. Step 5: Solve for x
    x = 807,652.94/859.52
  6. Step 6: Final answer
    x = 939.66

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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.