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Finding the Fourth Proportional to 855.06, 1,281.52 and 392.34

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Solution

The fourth proportional to 855.06, 1,281.52 and 392.34 is: 588.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    855.06 : 1,281.52 = 392.34 : x
  2. Step 2: Convert to fraction form
    855.06/1,281.52 = 392.34/x
  3. Step 3: Cross multiply
    855.06x = 1,281.52 × 392.34
  4. Step 4: Simplify right side
    855.06x = 502,796.85
  5. Step 5: Solve for x
    x = 502,796.85/855.06
  6. Step 6: Final answer
    x = 588.03

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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.