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Finding the Fourth Proportional to 1,439.76, 2,159.62 and 855.54

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Solution

The fourth proportional to 1,439.76, 2,159.62 and 855.54 is: 1,283.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,439.76 : 2,159.62 = 855.54 : x
  2. Step 2: Convert to fraction form
    1,439.76/2,159.62 = 855.54/x
  3. Step 3: Cross multiply
    1,439.76x = 2,159.62 × 855.54
  4. Step 4: Simplify right side
    1,439.76x = 1,847,641.29
  5. Step 5: Solve for x
    x = 1,847,641.29/1,439.76
  6. Step 6: Final answer
    x = 1,283.30

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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.