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Finding the Fourth Proportional to 812.04, 1,215.55 and 656.67

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Solution

The fourth proportional to 812.04, 1,215.55 and 656.67 is: 982.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    812.04 : 1,215.55 = 656.67 : x
  2. Step 2: Convert to fraction form
    812.04/1,215.55 = 656.67/x
  3. Step 3: Cross multiply
    812.04x = 1,215.55 × 656.67
  4. Step 4: Simplify right side
    812.04x = 798,211.94
  5. Step 5: Solve for x
    x = 798,211.94/812.04
  6. Step 6: Final answer
    x = 982.97

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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.