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Finding the Fourth Proportional to 20,988.52, 28,964.22 and 11,557.96

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Solution

The fourth proportional to 20,988.52, 28,964.22 and 11,557.96 is: 15,950.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,988.52 : 28,964.22 = 11,557.96 : x
  2. Step 2: Convert to fraction form
    20,988.52/28,964.22 = 11,557.96/x
  3. Step 3: Cross multiply
    20,988.52x = 28,964.22 × 11,557.96
  4. Step 4: Simplify right side
    20,988.52x = 334,767,296.19
  5. Step 5: Solve for x
    x = 334,767,296.19/20,988.52
  6. Step 6: Final answer
    x = 15,950.02

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Why These Related Problems?

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