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Finding the Fourth Proportional to 856.22, 1,283.12 and 660.48

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Solution

The fourth proportional to 856.22, 1,283.12 and 660.48 is: 989.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    856.22 : 1,283.12 = 660.48 : x
  2. Step 2: Convert to fraction form
    856.22/1,283.12 = 660.48/x
  3. Step 3: Cross multiply
    856.22x = 1,283.12 × 660.48
  4. Step 4: Simplify right side
    856.22x = 847,475.10
  5. Step 5: Solve for x
    x = 847,475.10/856.22
  6. Step 6: Final answer
    x = 989.79

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.