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Finding the Fourth Proportional to 1,121.90, 1,548.27 and 679.84

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Solution

The fourth proportional to 1,121.90, 1,548.27 and 679.84 is: 938.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,121.90 : 1,548.27 = 679.84 : x
  2. Step 2: Convert to fraction form
    1,121.90/1,548.27 = 679.84/x
  3. Step 3: Cross multiply
    1,121.90x = 1,548.27 × 679.84
  4. Step 4: Simplify right side
    1,121.90x = 1,052,572.01
  5. Step 5: Solve for x
    x = 1,052,572.01/1,121.90
  6. Step 6: Final answer
    x = 938.21

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1.5x scale

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.