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Finding the Fourth Proportional to 81,768.90, 122,653.35 and 76,844.10

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Solution

The fourth proportional to 81,768.90, 122,653.35 and 76,844.10 is: 115,266.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,768.90 : 122,653.35 = 76,844.10 : x
  2. Step 2: Convert to fraction form
    81,768.90/122,653.35 = 76,844.10/x
  3. Step 3: Cross multiply
    81,768.90x = 122,653.35 × 76,844.10
  4. Step 4: Simplify right side
    81,768.90x = 9,425,186,292.74
  5. Step 5: Solve for x
    x = 9,425,186,292.74/81,768.90
  6. Step 6: Final answer
    x = 115,266.15

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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.