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Finding the Fourth Proportional to 1,439.75, 2,159.90 and 854.46

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Solution

The fourth proportional to 1,439.75, 2,159.90 and 854.46 is: 1,281.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,439.75 : 2,159.90 = 854.46 : x
  2. Step 2: Convert to fraction form
    1,439.75/2,159.90 = 854.46/x
  3. Step 3: Cross multiply
    1,439.75x = 2,159.90 × 854.46
  4. Step 4: Simplify right side
    1,439.75x = 1,845,548.15
  5. Step 5: Solve for x
    x = 1,845,548.15/1,439.75
  6. Step 6: Final answer
    x = 1,281.85

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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.