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Finding the Fourth Proportional to 1,121.80, 1,548.48 and 680.08

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Solution

The fourth proportional to 1,121.80, 1,548.48 and 680.08 is: 938.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,121.80 : 1,548.48 = 680.08 : x
  2. Step 2: Convert to fraction form
    1,121.80/1,548.48 = 680.08/x
  3. Step 3: Cross multiply
    1,121.80x = 1,548.48 × 680.08
  4. Step 4: Simplify right side
    1,121.80x = 1,053,090.28
  5. Step 5: Solve for x
    x = 1,053,090.28/1,121.80
  6. Step 6: Final answer
    x = 938.75

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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.