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Finding the Fourth Proportional to 65,315.96, 90,139.60 and 36,644.70

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Solution

The fourth proportional to 65,315.96, 90,139.60 and 36,644.70 is: 50,571.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,315.96 : 90,139.60 = 36,644.70 : x
  2. Step 2: Convert to fraction form
    65,315.96/90,139.60 = 36,644.70/x
  3. Step 3: Cross multiply
    65,315.96x = 90,139.60 × 36,644.70
  4. Step 4: Simplify right side
    65,315.96x = 3,303,138,777.82
  5. Step 5: Solve for x
    x = 3,303,138,777.82/65,315.96
  6. Step 6: Final answer
    x = 50,571.69

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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.