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Finding the Fourth Proportional to 1,228.41, 1,840.57 and 862.55

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Solution

The fourth proportional to 1,228.41, 1,840.57 and 862.55 is: 1,292.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,228.41 : 1,840.57 = 862.55 : x
  2. Step 2: Convert to fraction form
    1,228.41/1,840.57 = 862.55/x
  3. Step 3: Cross multiply
    1,228.41x = 1,840.57 × 862.55
  4. Step 4: Simplify right side
    1,228.41x = 1,587,570.14
  5. Step 5: Solve for x
    x = 1,587,570.14/1,228.41
  6. Step 6: Final answer
    x = 1,292.38

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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.