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Finding the Fourth Proportional to 1,240.51, 1,861.20 and 825.71

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Solution

The fourth proportional to 1,240.51, 1,861.20 and 825.71 is: 1,238.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,240.51 : 1,861.20 = 825.71 : x
  2. Step 2: Convert to fraction form
    1,240.51/1,861.20 = 825.71/x
  3. Step 3: Cross multiply
    1,240.51x = 1,861.20 × 825.71
  4. Step 4: Simplify right side
    1,240.51x = 1,536,811.45
  5. Step 5: Solve for x
    x = 1,536,811.45/1,240.51
  6. Step 6: Final answer
    x = 1,238.85

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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.