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Finding the Fourth Proportional to 1,478, 2,216.94 and 861.26

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Solution

The fourth proportional to 1,478, 2,216.94 and 861.26 is: 1,291.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,478 : 2,216.94 = 861.26 : x
  2. Step 2: Convert to fraction form
    1,478/2,216.94 = 861.26/x
  3. Step 3: Cross multiply
    1,478x = 2,216.94 × 861.26
  4. Step 4: Simplify right side
    1,478x = 1,909,361.74
  5. Step 5: Solve for x
    x = 1,909,361.74/1,478
  6. Step 6: Final answer
    x = 1,291.86

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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.