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Finding the Fourth Proportional to 21,163.80, 31,702.86 and 10,081.20

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Solution

The fourth proportional to 21,163.80, 31,702.86 and 10,081.20 is: 15,101.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,163.80 : 31,702.86 = 10,081.20 : x
  2. Step 2: Convert to fraction form
    21,163.80/31,702.86 = 10,081.20/x
  3. Step 3: Cross multiply
    21,163.80x = 31,702.86 × 10,081.20
  4. Step 4: Simplify right side
    21,163.80x = 319,602,872.23
  5. Step 5: Solve for x
    x = 319,602,872.23/21,163.80
  6. Step 6: Final answer
    x = 15,101.39

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1.5x scale

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.