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Finding the Fourth Proportional to 1,255.87, 1,871.98 and 1,216.07

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Solution

The fourth proportional to 1,255.87, 1,871.98 and 1,216.07 is: 1,812.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,255.87 : 1,871.98 = 1,216.07 : x
  2. Step 2: Convert to fraction form
    1,255.87/1,871.98 = 1,216.07/x
  3. Step 3: Cross multiply
    1,255.87x = 1,871.98 × 1,216.07
  4. Step 4: Simplify right side
    1,255.87x = 2,276,453.34
  5. Step 5: Solve for x
    x = 2,276,453.34/1,255.87
  6. Step 6: Final answer
    x = 1,812.65

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.