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Finding the Fourth Proportional to 854.80, 1,282.38 and 392.65

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Solution

The fourth proportional to 854.80, 1,282.38 and 392.65 is: 589.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    854.80 : 1,282.38 = 392.65 : x
  2. Step 2: Convert to fraction form
    854.80/1,282.38 = 392.65/x
  3. Step 3: Cross multiply
    854.80x = 1,282.38 × 392.65
  4. Step 4: Simplify right side
    854.80x = 503,526.51
  5. Step 5: Solve for x
    x = 503,526.51/854.80
  6. Step 6: Final answer
    x = 589.06

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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.