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Finding the Fourth Proportional to 20,642.70, 28,487.28 and 11,689.98

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Solution

The fourth proportional to 20,642.70, 28,487.28 and 11,689.98 is: 16,132.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,642.70 : 28,487.28 = 11,689.98 : x
  2. Step 2: Convert to fraction form
    20,642.70/28,487.28 = 11,689.98/x
  3. Step 3: Cross multiply
    20,642.70x = 28,487.28 × 11,689.98
  4. Step 4: Simplify right side
    20,642.70x = 333,015,733.45
  5. Step 5: Solve for x
    x = 333,015,733.45/20,642.70
  6. Step 6: Final answer
    x = 16,132.37

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1.5x scale

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.