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Finding the Fourth Proportional to 291,843.70, 437,711.55 and 81,438.10

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Solution

The fourth proportional to 291,843.70, 437,711.55 and 81,438.10 is: 122,142.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    291,843.70 : 437,711.55 = 81,438.10 : x
  2. Step 2: Convert to fraction form
    291,843.70/437,711.55 = 81,438.10/x
  3. Step 3: Cross multiply
    291,843.70x = 437,711.55 × 81,438.10
  4. Step 4: Simplify right side
    291,843.70x = 35,646,396,980.06
  5. Step 5: Solve for x
    x = 35,646,396,980.06/291,843.70
  6. Step 6: Final answer
    x = 122,142.08

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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.