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Finding the Fourth Proportional to 21,931.82, 30,263.55 and 12,979.70

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Solution

The fourth proportional to 21,931.82, 30,263.55 and 12,979.70 is: 17,910.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,931.82 : 30,263.55 = 12,979.70 : x
  2. Step 2: Convert to fraction form
    21,931.82/30,263.55 = 12,979.70/x
  3. Step 3: Cross multiply
    21,931.82x = 30,263.55 × 12,979.70
  4. Step 4: Simplify right side
    21,931.82x = 392,811,799.94
  5. Step 5: Solve for x
    x = 392,811,799.94/21,931.82
  6. Step 6: Final answer
    x = 17,910.59

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.