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Finding the Fourth Proportional to 38,387.90, 52,974.60 and 21,620.90

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Solution

The fourth proportional to 38,387.90, 52,974.60 and 21,620.90 is: 29,836.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,387.90 : 52,974.60 = 21,620.90 : x
  2. Step 2: Convert to fraction form
    38,387.90/52,974.60 = 21,620.90/x
  3. Step 3: Cross multiply
    38,387.90x = 52,974.60 × 21,620.90
  4. Step 4: Simplify right side
    38,387.90x = 1,145,358,529.14
  5. Step 5: Solve for x
    x = 1,145,358,529.14/38,387.90
  6. Step 6: Final answer
    x = 29,836.45

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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.