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Finding the Fourth Proportional to 2,921.33, 4,380.38 and 972.47

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Solution

The fourth proportional to 2,921.33, 4,380.38 and 972.47 is: 1,458.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,921.33 : 4,380.38 = 972.47 : x
  2. Step 2: Convert to fraction form
    2,921.33/4,380.38 = 972.47/x
  3. Step 3: Cross multiply
    2,921.33x = 4,380.38 × 972.47
  4. Step 4: Simplify right side
    2,921.33x = 4,259,797.87
  5. Step 5: Solve for x
    x = 4,259,797.87/2,921.33
  6. Step 6: Final answer
    x = 1,458.17

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1.5x scale

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.