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Finding the Fourth Proportional to 65,366.87, 90,221.65 and 39,894.30

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Solution

The fourth proportional to 65,366.87, 90,221.65 and 39,894.30 is: 55,063.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,366.87 : 90,221.65 = 39,894.30 : x
  2. Step 2: Convert to fraction form
    65,366.87/90,221.65 = 39,894.30/x
  3. Step 3: Cross multiply
    65,366.87x = 90,221.65 × 39,894.30
  4. Step 4: Simplify right side
    65,366.87x = 3,599,329,471.86
  5. Step 5: Solve for x
    x = 3,599,329,471.86/65,366.87
  6. Step 6: Final answer
    x = 55,063.52

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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.