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Finding the Fourth Proportional to 1,512.78, 2,087.60 and 849.61

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Solution

The fourth proportional to 1,512.78, 2,087.60 and 849.61 is: 1,172.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,512.78 : 2,087.60 = 849.61 : x
  2. Step 2: Convert to fraction form
    1,512.78/2,087.60 = 849.61/x
  3. Step 3: Cross multiply
    1,512.78x = 2,087.60 × 849.61
  4. Step 4: Simplify right side
    1,512.78x = 1,773,652.46
  5. Step 5: Solve for x
    x = 1,773,652.46/1,512.78
  6. Step 6: Final answer
    x = 1,172.45

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.