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Finding the Fourth Proportional to 81,579.38, 122,369.06 and 28,990.94

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Solution

The fourth proportional to 81,579.38, 122,369.06 and 28,990.94 is: 43,486.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,579.38 : 122,369.06 = 28,990.94 : x
  2. Step 2: Convert to fraction form
    81,579.38/122,369.06 = 28,990.94/x
  3. Step 3: Cross multiply
    81,579.38x = 122,369.06 × 28,990.94
  4. Step 4: Simplify right side
    81,579.38x = 3,547,593,536.95
  5. Step 5: Solve for x
    x = 3,547,593,536.95/81,579.38
  6. Step 6: Final answer
    x = 43,486.40

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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.