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Finding the Fourth Proportional to 1,107.61, 1,661.34 and 673.86

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Solution

The fourth proportional to 1,107.61, 1,661.34 and 673.86 is: 1,010.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,107.61 : 1,661.34 = 673.86 : x
  2. Step 2: Convert to fraction form
    1,107.61/1,661.34 = 673.86/x
  3. Step 3: Cross multiply
    1,107.61x = 1,661.34 × 673.86
  4. Step 4: Simplify right side
    1,107.61x = 1,119,510.57
  5. Step 5: Solve for x
    x = 1,119,510.57/1,107.61
  6. Step 6: Final answer
    x = 1,010.74

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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.