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Finding the Fourth Proportional to 85,906.17, 128,858.76 and 33,315.21

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Solution

The fourth proportional to 85,906.17, 128,858.76 and 33,315.21 is: 49,972.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,906.17 : 128,858.76 = 33,315.21 : x
  2. Step 2: Convert to fraction form
    85,906.17/128,858.76 = 33,315.21/x
  3. Step 3: Cross multiply
    85,906.17x = 128,858.76 × 33,315.21
  4. Step 4: Simplify right side
    85,906.17x = 4,292,956,649.74
  5. Step 5: Solve for x
    x = 4,292,956,649.74/85,906.17
  6. Step 6: Final answer
    x = 49,972.62

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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.