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Finding the Fourth Proportional to 855.31, 1,281.99 and 335.06

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Solution

The fourth proportional to 855.31, 1,281.99 and 335.06 is: 502.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    855.31 : 1,281.99 = 335.06 : x
  2. Step 2: Convert to fraction form
    855.31/1,281.99 = 335.06/x
  3. Step 3: Cross multiply
    855.31x = 1,281.99 × 335.06
  4. Step 4: Simplify right side
    855.31x = 429,543.57
  5. Step 5: Solve for x
    x = 429,543.57/855.31
  6. Step 6: Final answer
    x = 502.21

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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.