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Finding the Fourth Proportional to 1,040.37, 1,434.90 and 667.38

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Solution

The fourth proportional to 1,040.37, 1,434.90 and 667.38 is: 920.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,040.37 : 1,434.90 = 667.38 : x
  2. Step 2: Convert to fraction form
    1,040.37/1,434.90 = 667.38/x
  3. Step 3: Cross multiply
    1,040.37x = 1,434.90 × 667.38
  4. Step 4: Simplify right side
    1,040.37x = 957,623.56
  5. Step 5: Solve for x
    x = 957,623.56/1,040.37
  6. Step 6: Final answer
    x = 920.46

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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.