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Finding the Fourth Proportional to 39,805.46, 54,931.13 and 21,900.48

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Solution

The fourth proportional to 39,805.46, 54,931.13 and 21,900.48 is: 30,222.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,805.46 : 54,931.13 = 21,900.48 : x
  2. Step 2: Convert to fraction form
    39,805.46/54,931.13 = 21,900.48/x
  3. Step 3: Cross multiply
    39,805.46x = 54,931.13 × 21,900.48
  4. Step 4: Simplify right side
    39,805.46x = 1,203,017,880.58
  5. Step 5: Solve for x
    x = 1,203,017,880.58/39,805.46
  6. Step 6: Final answer
    x = 30,222.43

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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.