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Finding the Fourth Proportional to 81,970.60, 122,955.90 and 81,452.20

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Solution

The fourth proportional to 81,970.60, 122,955.90 and 81,452.20 is: 122,178.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,970.60 : 122,955.90 = 81,452.20 : x
  2. Step 2: Convert to fraction form
    81,970.60/122,955.90 = 81,452.20/x
  3. Step 3: Cross multiply
    81,970.60x = 122,955.90 × 81,452.20
  4. Step 4: Simplify right side
    81,970.60x = 10,015,028,557.98
  5. Step 5: Solve for x
    x = 10,015,028,557.98/81,970.60
  6. Step 6: Final answer
    x = 122,178.30

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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.