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Finding the Fourth Proportional to 855.12, 1,282.77 and 392.91

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Solution

The fourth proportional to 855.12, 1,282.77 and 392.91 is: 589.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    855.12 : 1,282.77 = 392.91 : x
  2. Step 2: Convert to fraction form
    855.12/1,282.77 = 392.91/x
  3. Step 3: Cross multiply
    855.12x = 1,282.77 × 392.91
  4. Step 4: Simplify right side
    855.12x = 504,013.16
  5. Step 5: Solve for x
    x = 504,013.16/855.12
  6. Step 6: Final answer
    x = 589.41

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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.