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Finding the Fourth Proportional to 60,861, 91,299.20 and 20,887.78

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Solution

The fourth proportional to 60,861, 91,299.20 and 20,887.78 is: 31,334.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    60,861 : 91,299.20 = 20,887.78 : x
  2. Step 2: Convert to fraction form
    60,861/91,299.20 = 20,887.78/x
  3. Step 3: Cross multiply
    60,861x = 91,299.20 × 20,887.78
  4. Step 4: Simplify right side
    60,861x = 1,907,037,603.78
  5. Step 5: Solve for x
    x = 1,907,037,603.78/60,861
  6. Step 6: Final answer
    x = 31,334.31

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.