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Finding the Fourth Proportional to 969.12, 1,452.75 and 621.48

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Solution

The fourth proportional to 969.12, 1,452.75 and 621.48 is: 931.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    969.12 : 1,452.75 = 621.48 : x
  2. Step 2: Convert to fraction form
    969.12/1,452.75 = 621.48/x
  3. Step 3: Cross multiply
    969.12x = 1,452.75 × 621.48
  4. Step 4: Simplify right side
    969.12x = 902,855.07
  5. Step 5: Solve for x
    x = 902,855.07/969.12
  6. Step 6: Final answer
    x = 931.62

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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.