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Finding the Fourth Proportional to 851.75, 1,278.80 and 609.65

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Solution

The fourth proportional to 851.75, 1,278.80 and 609.65 is: 915.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    851.75 : 1,278.80 = 609.65 : x
  2. Step 2: Convert to fraction form
    851.75/1,278.80 = 609.65/x
  3. Step 3: Cross multiply
    851.75x = 1,278.80 × 609.65
  4. Step 4: Simplify right side
    851.75x = 779,620.42
  5. Step 5: Solve for x
    x = 779,620.42/851.75
  6. Step 6: Final answer
    x = 915.32

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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.