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Finding the Fourth Proportional to 81,266.80, 121,900.20 and 51,815.20

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Solution

The fourth proportional to 81,266.80, 121,900.20 and 51,815.20 is: 77,722.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,266.80 : 121,900.20 = 51,815.20 : x
  2. Step 2: Convert to fraction form
    81,266.80/121,900.20 = 51,815.20/x
  3. Step 3: Cross multiply
    81,266.80x = 121,900.20 × 51,815.20
  4. Step 4: Simplify right side
    81,266.80x = 6,316,283,243.04
  5. Step 5: Solve for x
    x = 6,316,283,243.04/81,266.80
  6. Step 6: Final answer
    x = 77,722.80

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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.