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Finding the Fourth Proportional to 85,841.91, 128,761.58 and 20,926.58

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Solution

The fourth proportional to 85,841.91, 128,761.58 and 20,926.58 is: 31,389.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,841.91 : 128,761.58 = 20,926.58 : x
  2. Step 2: Convert to fraction form
    85,841.91/128,761.58 = 20,926.58/x
  3. Step 3: Cross multiply
    85,841.91x = 128,761.58 × 20,926.58
  4. Step 4: Simplify right side
    85,841.91x = 2,694,538,913.30
  5. Step 5: Solve for x
    x = 2,694,538,913.30/85,841.91
  6. Step 6: Final answer
    x = 31,389.55

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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.