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Finding the Fourth Proportional to 855.72, 1,282.62 and 423.18

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Solution

The fourth proportional to 855.72, 1,282.62 and 423.18 is: 634.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    855.72 : 1,282.62 = 423.18 : x
  2. Step 2: Convert to fraction form
    855.72/1,282.62 = 423.18/x
  3. Step 3: Cross multiply
    855.72x = 1,282.62 × 423.18
  4. Step 4: Simplify right side
    855.72x = 542,779.13
  5. Step 5: Solve for x
    x = 542,779.13/855.72
  6. Step 6: Final answer
    x = 634.30

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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.