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Finding the Fourth Proportional to 1,188.31, 1,640.78 and 925.87

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Solution

The fourth proportional to 1,188.31, 1,640.78 and 925.87 is: 1,278.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,188.31 : 1,640.78 = 925.87 : x
  2. Step 2: Convert to fraction form
    1,188.31/1,640.78 = 925.87/x
  3. Step 3: Cross multiply
    1,188.31x = 1,640.78 × 925.87
  4. Step 4: Simplify right side
    1,188.31x = 1,519,148.98
  5. Step 5: Solve for x
    x = 1,519,148.98/1,188.31
  6. Step 6: Final answer
    x = 1,278.41

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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.