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Finding the Fourth Proportional to 65,667.11, 90,620.53 and 38,819.30

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Solution

The fourth proportional to 65,667.11, 90,620.53 and 38,819.30 is: 53,570.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,667.11 : 90,620.53 = 38,819.30 : x
  2. Step 2: Convert to fraction form
    65,667.11/90,620.53 = 38,819.30/x
  3. Step 3: Cross multiply
    65,667.11x = 90,620.53 × 38,819.30
  4. Step 4: Simplify right side
    65,667.11x = 3,517,824,990.08
  5. Step 5: Solve for x
    x = 3,517,824,990.08/65,667.11
  6. Step 6: Final answer
    x = 53,570.58

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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.