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Finding the Fourth Proportional to 763.05, 1,141.85 and 660.69

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Solution

The fourth proportional to 763.05, 1,141.85 and 660.69 is: 988.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    763.05 : 1,141.85 = 660.69 : x
  2. Step 2: Convert to fraction form
    763.05/1,141.85 = 660.69/x
  3. Step 3: Cross multiply
    763.05x = 1,141.85 × 660.69
  4. Step 4: Simplify right side
    763.05x = 754,406.81
  5. Step 5: Solve for x
    x = 754,406.81/763.05
  6. Step 6: Final answer
    x = 988.67

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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.