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Finding the Fourth Proportional to 1,391.98, 1,921.12 and 867.74

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Solution

The fourth proportional to 1,391.98, 1,921.12 and 867.74 is: 1,197.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,391.98 : 1,921.12 = 867.74 : x
  2. Step 2: Convert to fraction form
    1,391.98/1,921.12 = 867.74/x
  3. Step 3: Cross multiply
    1,391.98x = 1,921.12 × 867.74
  4. Step 4: Simplify right side
    1,391.98x = 1,667,032.67
  5. Step 5: Solve for x
    x = 1,667,032.67/1,391.98
  6. Step 6: Final answer
    x = 1,197.60

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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.