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Finding the Fourth Proportional to 2,505.36, 3,758.30 and 861.70

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Solution

The fourth proportional to 2,505.36, 3,758.30 and 861.70 is: 1,292.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,505.36 : 3,758.30 = 861.70 : x
  2. Step 2: Convert to fraction form
    2,505.36/3,758.30 = 861.70/x
  3. Step 3: Cross multiply
    2,505.36x = 3,758.30 × 861.70
  4. Step 4: Simplify right side
    2,505.36x = 3,238,527.11
  5. Step 5: Solve for x
    x = 3,238,527.11/2,505.36
  6. Step 6: Final answer
    x = 1,292.64

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1.5x scale

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.