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Finding the Fourth Proportional to 65,236.60, 90,019.38 and 38,387.80

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Solution

The fourth proportional to 65,236.60, 90,019.38 and 38,387.80 is: 52,970.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,236.60 : 90,019.38 = 38,387.80 : x
  2. Step 2: Convert to fraction form
    65,236.60/90,019.38 = 38,387.80/x
  3. Step 3: Cross multiply
    65,236.60x = 90,019.38 × 38,387.80
  4. Step 4: Simplify right side
    65,236.60x = 3,455,645,955.56
  5. Step 5: Solve for x
    x = 3,455,645,955.56/65,236.60
  6. Step 6: Final answer
    x = 52,970.97

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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.