Home / 20,787.93-28,687.23-11,356.47

Finding the Fourth Proportional to 20,787.93, 28,687.23 and 11,356.47

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Solution

The fourth proportional to 20,787.93, 28,687.23 and 11,356.47 is: 15,671.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,787.93 : 28,687.23 = 11,356.47 : x
  2. Step 2: Convert to fraction form
    20,787.93/28,687.23 = 11,356.47/x
  3. Step 3: Cross multiply
    20,787.93x = 28,687.23 × 11,356.47
  4. Step 4: Simplify right side
    20,787.93x = 325,785,666.88
  5. Step 5: Solve for x
    x = 325,785,666.88/20,787.93
  6. Step 6: Final answer
    x = 15,671.87

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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.