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Finding the Fourth Proportional to 851.28, 1,279.46 and 705.98

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Solution

The fourth proportional to 851.28, 1,279.46 and 705.98 is: 1,061.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    851.28 : 1,279.46 = 705.98 : x
  2. Step 2: Convert to fraction form
    851.28/1,279.46 = 705.98/x
  3. Step 3: Cross multiply
    851.28x = 1,279.46 × 705.98
  4. Step 4: Simplify right side
    851.28x = 903,278.13
  5. Step 5: Solve for x
    x = 903,278.13/851.28
  6. Step 6: Final answer
    x = 1,061.09

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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.