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Finding the Fourth Proportional to 969.68, 1,454.40 and 392.56

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Solution

The fourth proportional to 969.68, 1,454.40 and 392.56 is: 588.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    969.68 : 1,454.40 = 392.56 : x
  2. Step 2: Convert to fraction form
    969.68/1,454.40 = 392.56/x
  3. Step 3: Cross multiply
    969.68x = 1,454.40 × 392.56
  4. Step 4: Simplify right side
    969.68x = 570,939.26
  5. Step 5: Solve for x
    x = 570,939.26/969.68
  6. Step 6: Final answer
    x = 588.79

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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.