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Finding the Fourth Proportional to 81,966.60, 122,949.90 and 42,600.60

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Solution

The fourth proportional to 81,966.60, 122,949.90 and 42,600.60 is: 63,900.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,966.60 : 122,949.90 = 42,600.60 : x
  2. Step 2: Convert to fraction form
    81,966.60/122,949.90 = 42,600.60/x
  3. Step 3: Cross multiply
    81,966.60x = 122,949.90 × 42,600.60
  4. Step 4: Simplify right side
    81,966.60x = 5,237,739,509.94
  5. Step 5: Solve for x
    x = 5,237,739,509.94/81,966.60
  6. Step 6: Final answer
    x = 63,900.90

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1.5x scale

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.