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Finding the Fourth Proportional to 38,509.75, 53,143.46 and 20,845.75

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Solution

The fourth proportional to 38,509.75, 53,143.46 and 20,845.75 is: 28,767.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,509.75 : 53,143.46 = 20,845.75 : x
  2. Step 2: Convert to fraction form
    38,509.75/53,143.46 = 20,845.75/x
  3. Step 3: Cross multiply
    38,509.75x = 53,143.46 × 20,845.75
  4. Step 4: Simplify right side
    38,509.75x = 1,107,815,281.30
  5. Step 5: Solve for x
    x = 1,107,815,281.30/38,509.75
  6. Step 6: Final answer
    x = 28,767.14

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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.