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Finding the Fourth Proportional to 1,066.76, 1,474.02 and 856.68

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Solution

The fourth proportional to 1,066.76, 1,474.02 and 856.68 is: 1,183.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,066.76 : 1,474.02 = 856.68 : x
  2. Step 2: Convert to fraction form
    1,066.76/1,474.02 = 856.68/x
  3. Step 3: Cross multiply
    1,066.76x = 1,474.02 × 856.68
  4. Step 4: Simplify right side
    1,066.76x = 1,262,763.45
  5. Step 5: Solve for x
    x = 1,262,763.45/1,066.76
  6. Step 6: Final answer
    x = 1,183.74

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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.