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Finding the Fourth Proportional to 65,367.85, 90,213.74 and 38,518.69

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Solution

The fourth proportional to 65,367.85, 90,213.74 and 38,518.69 is: 53,159.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,367.85 : 90,213.74 = 38,518.69 : x
  2. Step 2: Convert to fraction form
    65,367.85/90,213.74 = 38,518.69/x
  3. Step 3: Cross multiply
    65,367.85x = 90,213.74 × 38,518.69
  4. Step 4: Simplify right side
    65,367.85x = 3,474,915,084.80
  5. Step 5: Solve for x
    x = 3,474,915,084.80/65,367.85
  6. Step 6: Final answer
    x = 53,159.39

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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.