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Finding the Fourth Proportional to 39,806.70, 54,931.86 and 21,901.52

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Solution

The fourth proportional to 39,806.70, 54,931.86 and 21,901.52 is: 30,223.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,806.70 : 54,931.86 = 21,901.52 : x
  2. Step 2: Convert to fraction form
    39,806.70/54,931.86 = 21,901.52/x
  3. Step 3: Cross multiply
    39,806.70x = 54,931.86 × 21,901.52
  4. Step 4: Simplify right side
    39,806.70x = 1,203,091,230.43
  5. Step 5: Solve for x
    x = 1,203,091,230.43/39,806.70
  6. Step 6: Final answer
    x = 30,223.34

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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.