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Finding the Fourth Proportional to 85,991.85, 128,981.70 and 29,818.35

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Solution

The fourth proportional to 85,991.85, 128,981.70 and 29,818.35 is: 44,725.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,991.85 : 128,981.70 = 29,818.35 : x
  2. Step 2: Convert to fraction form
    85,991.85/128,981.70 = 29,818.35/x
  3. Step 3: Cross multiply
    85,991.85x = 128,981.70 × 29,818.35
  4. Step 4: Simplify right side
    85,991.85x = 3,846,021,474.20
  5. Step 5: Solve for x
    x = 3,846,021,474.20/85,991.85
  6. Step 6: Final answer
    x = 44,725.42

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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.