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Finding the Fourth Proportional to 1,065.54, 1,471.16 and 667.36

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Solution

The fourth proportional to 1,065.54, 1,471.16 and 667.36 is: 921.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,065.54 : 1,471.16 = 667.36 : x
  2. Step 2: Convert to fraction form
    1,065.54/1,471.16 = 667.36/x
  3. Step 3: Cross multiply
    1,065.54x = 1,471.16 × 667.36
  4. Step 4: Simplify right side
    1,065.54x = 981,791.33
  5. Step 5: Solve for x
    x = 981,791.33/1,065.54
  6. Step 6: Final answer
    x = 921.40

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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.