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Finding the Fourth Proportional to 13,891.16, 20,827.02 and 5,123.72

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Solution

The fourth proportional to 13,891.16, 20,827.02 and 5,123.72 is: 7,681.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,891.16 : 20,827.02 = 5,123.72 : x
  2. Step 2: Convert to fraction form
    13,891.16/20,827.02 = 5,123.72/x
  3. Step 3: Cross multiply
    13,891.16x = 20,827.02 × 5,123.72
  4. Step 4: Simplify right side
    13,891.16x = 106,711,818.91
  5. Step 5: Solve for x
    x = 106,711,818.91/13,891.16
  6. Step 6: Final answer
    x = 7,681.99

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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.