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Finding the Fourth Proportional to 813.28, 1,211.60 and 774.10

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Solution

The fourth proportional to 813.28, 1,211.60 and 774.10 is: 1,153.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    813.28 : 1,211.60 = 774.10 : x
  2. Step 2: Convert to fraction form
    813.28/1,211.60 = 774.10/x
  3. Step 3: Cross multiply
    813.28x = 1,211.60 × 774.10
  4. Step 4: Simplify right side
    813.28x = 937,889.63
  5. Step 5: Solve for x
    x = 937,889.63/813.28
  6. Step 6: Final answer
    x = 1,153.22

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.