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Finding the Fourth Proportional to 65,381.52, 90,202.20 and 39,879.08

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Solution

The fourth proportional to 65,381.52, 90,202.20 and 39,879.08 is: 55,018.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,381.52 : 90,202.20 = 39,879.08 : x
  2. Step 2: Convert to fraction form
    65,381.52/90,202.20 = 39,879.08/x
  3. Step 3: Cross multiply
    65,381.52x = 90,202.20 × 39,879.08
  4. Step 4: Simplify right side
    65,381.52x = 3,597,180,749.98
  5. Step 5: Solve for x
    x = 3,597,180,749.98/65,381.52
  6. Step 6: Final answer
    x = 55,018.31

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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.