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Finding the Fourth Proportional to 921.38, 1,268.97 and 856.81

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Solution

The fourth proportional to 921.38, 1,268.97 and 856.81 is: 1,180.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    921.38 : 1,268.97 = 856.81 : x
  2. Step 2: Convert to fraction form
    921.38/1,268.97 = 856.81/x
  3. Step 3: Cross multiply
    921.38x = 1,268.97 × 856.81
  4. Step 4: Simplify right side
    921.38x = 1,087,264.56
  5. Step 5: Solve for x
    x = 1,087,264.56/921.38
  6. Step 6: Final answer
    x = 1,180.05

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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.