Home / 81,981.40-122,972.10-80,426.20

Finding the Fourth Proportional to 81,981.40, 122,972.10 and 80,426.20

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Solution

The fourth proportional to 81,981.40, 122,972.10 and 80,426.20 is: 120,639.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,981.40 : 122,972.10 = 80,426.20 : x
  2. Step 2: Convert to fraction form
    81,981.40/122,972.10 = 80,426.20/x
  3. Step 3: Cross multiply
    81,981.40x = 122,972.10 × 80,426.20
  4. Step 4: Simplify right side
    81,981.40x = 9,890,178,709.02
  5. Step 5: Solve for x
    x = 9,890,178,709.02/81,981.40
  6. Step 6: Final answer
    x = 120,639.30

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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.