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Finding the Fourth Proportional to 85,838.70, 128,758.05 and 26,680.35

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Solution

The fourth proportional to 85,838.70, 128,758.05 and 26,680.35 is: 40,020.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,838.70 : 128,758.05 = 26,680.35 : x
  2. Step 2: Convert to fraction form
    85,838.70/128,758.05 = 26,680.35/x
  3. Step 3: Cross multiply
    85,838.70x = 128,758.05 × 26,680.35
  4. Step 4: Simplify right side
    85,838.70x = 3,435,309,839.32
  5. Step 5: Solve for x
    x = 3,435,309,839.32/85,838.70
  6. Step 6: Final answer
    x = 40,020.53

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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.