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Finding the Fourth Proportional to 38,588.40, 53,251.20 and 21,821.40

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Solution

The fourth proportional to 38,588.40, 53,251.20 and 21,821.40 is: 30,113.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,588.40 : 53,251.20 = 21,821.40 : x
  2. Step 2: Convert to fraction form
    38,588.40/53,251.20 = 21,821.40/x
  3. Step 3: Cross multiply
    38,588.40x = 53,251.20 × 21,821.40
  4. Step 4: Simplify right side
    38,588.40x = 1,162,015,735.68
  5. Step 5: Solve for x
    x = 1,162,015,735.68/38,588.40
  6. Step 6: Final answer
    x = 30,113.08

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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.