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Finding the Fourth Proportional to 81,980.30, 122,970.45 and 67,400.30

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Solution

The fourth proportional to 81,980.30, 122,970.45 and 67,400.30 is: 101,100.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,980.30 : 122,970.45 = 67,400.30 : x
  2. Step 2: Convert to fraction form
    81,980.30/122,970.45 = 67,400.30/x
  3. Step 3: Cross multiply
    81,980.30x = 122,970.45 × 67,400.30
  4. Step 4: Simplify right side
    81,980.30x = 8,288,245,221.14
  5. Step 5: Solve for x
    x = 8,288,245,221.14/81,980.30
  6. Step 6: Final answer
    x = 101,100.45

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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.