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Finding the Fourth Proportional to 82,812.70, 124,219.05 and 76,980.70

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Solution

The fourth proportional to 82,812.70, 124,219.05 and 76,980.70 is: 115,471.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    82,812.70 : 124,219.05 = 76,980.70 : x
  2. Step 2: Convert to fraction form
    82,812.70/124,219.05 = 76,980.70/x
  3. Step 3: Cross multiply
    82,812.70x = 124,219.05 × 76,980.70
  4. Step 4: Simplify right side
    82,812.70x = 9,562,469,422.34
  5. Step 5: Solve for x
    x = 9,562,469,422.34/82,812.70
  6. Step 6: Final answer
    x = 115,471.05

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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.