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Finding the Fourth Proportional to 969.79, 1,338.56 and 615.92

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Solution

The fourth proportional to 969.79, 1,338.56 and 615.92 is: 850.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    969.79 : 1,338.56 = 615.92 : x
  2. Step 2: Convert to fraction form
    969.79/1,338.56 = 615.92/x
  3. Step 3: Cross multiply
    969.79x = 1,338.56 × 615.92
  4. Step 4: Simplify right side
    969.79x = 824,445.88
  5. Step 5: Solve for x
    x = 824,445.88/969.79
  6. Step 6: Final answer
    x = 850.13

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.