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Finding the Fourth Proportional to 26,930.70, 40,397.81 and 21,989.70

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Solution

The fourth proportional to 26,930.70, 40,397.81 and 21,989.70 is: 32,985.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    26,930.70 : 40,397.81 = 21,989.70 : x
  2. Step 2: Convert to fraction form
    26,930.70/40,397.81 = 21,989.70/x
  3. Step 3: Cross multiply
    26,930.70x = 40,397.81 × 21,989.70
  4. Step 4: Simplify right side
    26,930.70x = 888,335,612.61
  5. Step 5: Solve for x
    x = 888,335,612.61/26,930.70
  6. Step 6: Final answer
    x = 32,985.98

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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.