Home / 20,787.89-28,687.29-11,356.45

Finding the Fourth Proportional to 20,787.89, 28,687.29 and 11,356.45

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Solution

The fourth proportional to 20,787.89, 28,687.29 and 11,356.45 is: 15,671.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,787.89 : 28,687.29 = 11,356.45 : x
  2. Step 2: Convert to fraction form
    20,787.89/28,687.29 = 11,356.45/x
  3. Step 3: Cross multiply
    20,787.89x = 28,687.29 × 11,356.45
  4. Step 4: Simplify right side
    20,787.89x = 325,785,853.52
  5. Step 5: Solve for x
    x = 325,785,853.52/20,787.89
  6. Step 6: Final answer
    x = 15,671.91

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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.