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Finding the Fourth Proportional to 913.34, 1,372.74 and 812.19

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Solution

The fourth proportional to 913.34, 1,372.74 and 812.19 is: 1,220.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    913.34 : 1,372.74 = 812.19 : x
  2. Step 2: Convert to fraction form
    913.34/1,372.74 = 812.19/x
  3. Step 3: Cross multiply
    913.34x = 1,372.74 × 812.19
  4. Step 4: Simplify right side
    913.34x = 1,114,925.70
  5. Step 5: Solve for x
    x = 1,114,925.70/913.34
  6. Step 6: Final answer
    x = 1,220.71

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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.