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Finding the Fourth Proportional to 1,439.46, 2,157.96 and 855.05

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Solution

The fourth proportional to 1,439.46, 2,157.96 and 855.05 is: 1,281.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,439.46 : 2,157.96 = 855.05 : x
  2. Step 2: Convert to fraction form
    1,439.46/2,157.96 = 855.05/x
  3. Step 3: Cross multiply
    1,439.46x = 2,157.96 × 855.05
  4. Step 4: Simplify right side
    1,439.46x = 1,845,152.91
  5. Step 5: Solve for x
    x = 1,845,152.91/1,439.46
  6. Step 6: Final answer
    x = 1,281.84

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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.