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Finding the Fourth Proportional to 851.92, 1,278.36 and 461.93

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Solution

The fourth proportional to 851.92, 1,278.36 and 461.93 is: 693.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    851.92 : 1,278.36 = 461.93 : x
  2. Step 2: Convert to fraction form
    851.92/1,278.36 = 461.93/x
  3. Step 3: Cross multiply
    851.92x = 1,278.36 × 461.93
  4. Step 4: Simplify right side
    851.92x = 590,506.44
  5. Step 5: Solve for x
    x = 590,506.44/851.92
  6. Step 6: Final answer
    x = 693.15

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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.