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Finding the Fourth Proportional to 39,648.75, 54,715.28 and 21,984.75

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Solution

The fourth proportional to 39,648.75, 54,715.28 and 21,984.75 is: 30,338.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,648.75 : 54,715.28 = 21,984.75 : x
  2. Step 2: Convert to fraction form
    39,648.75/54,715.28 = 21,984.75/x
  3. Step 3: Cross multiply
    39,648.75x = 54,715.28 × 21,984.75
  4. Step 4: Simplify right side
    39,648.75x = 1,202,901,642.06
  5. Step 5: Solve for x
    x = 1,202,901,642.06/39,648.75
  6. Step 6: Final answer
    x = 30,338.96

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1.5x scale

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.