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Finding the Fourth Proportional to 1,112.79, 1,669.23 and 674.50

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Solution

The fourth proportional to 1,112.79, 1,669.23 and 674.50 is: 1,011.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,112.79 : 1,669.23 = 674.50 : x
  2. Step 2: Convert to fraction form
    1,112.79/1,669.23 = 674.50/x
  3. Step 3: Cross multiply
    1,112.79x = 1,669.23 × 674.50
  4. Step 4: Simplify right side
    1,112.79x = 1,125,901.18
  5. Step 5: Solve for x
    x = 1,125,901.18/1,112.79
  6. Step 6: Final answer
    x = 1,011.78

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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.