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Finding the Fourth Proportional to 27,720.69, 41,602.90 and 12,921.99

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Solution

The fourth proportional to 27,720.69, 41,602.90 and 12,921.99 is: 19,393.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    27,720.69 : 41,602.90 = 12,921.99 : x
  2. Step 2: Convert to fraction form
    27,720.69/41,602.90 = 12,921.99/x
  3. Step 3: Cross multiply
    27,720.69x = 41,602.90 × 12,921.99
  4. Step 4: Simplify right side
    27,720.69x = 537,592,257.77
  5. Step 5: Solve for x
    x = 537,592,257.77/27,720.69
  6. Step 6: Final answer
    x = 19,393.18

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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.