Home / 20,787.80-28,686.74-11,356.43

Finding the Fourth Proportional to 20,787.80, 28,686.74 and 11,356.43

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Solution

The fourth proportional to 20,787.80, 28,686.74 and 11,356.43 is: 15,671.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,787.80 : 28,686.74 = 11,356.43 : x
  2. Step 2: Convert to fraction form
    20,787.80/28,686.74 = 11,356.43/x
  3. Step 3: Cross multiply
    20,787.80x = 28,686.74 × 11,356.43
  4. Step 4: Simplify right side
    20,787.80x = 325,778,754.52
  5. Step 5: Solve for x
    x = 325,778,754.52/20,787.80
  6. Step 6: Final answer
    x = 15,671.64

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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.