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Finding the Fourth Proportional to 20,787, 28,686.69 and 11,356.17

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Solution

The fourth proportional to 20,787, 28,686.69 and 11,356.17 is: 15,671.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,787 : 28,686.69 = 11,356.17 : x
  2. Step 2: Convert to fraction form
    20,787/28,686.69 = 11,356.17/x
  3. Step 3: Cross multiply
    20,787x = 28,686.69 × 11,356.17
  4. Step 4: Simplify right side
    20,787x = 325,770,928.38
  5. Step 5: Solve for x
    x = 325,770,928.38/20,787
  6. Step 6: Final answer
    x = 15,671.86

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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.