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Finding the Fourth Proportional to 2,710.60, 4,065.90 and 861.70

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Solution

The fourth proportional to 2,710.60, 4,065.90 and 861.70 is: 1,292.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,710.60 : 4,065.90 = 861.70 : x
  2. Step 2: Convert to fraction form
    2,710.60/4,065.90 = 861.70/x
  3. Step 3: Cross multiply
    2,710.60x = 4,065.90 × 861.70
  4. Step 4: Simplify right side
    2,710.60x = 3,503,586.03
  5. Step 5: Solve for x
    x = 3,503,586.03/2,710.60
  6. Step 6: Final answer
    x = 1,292.55

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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.