Home / 20,787.57-28,686.79-11,356.20

Finding the Fourth Proportional to 20,787.57, 28,686.79 and 11,356.20

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Solution

The fourth proportional to 20,787.57, 28,686.79 and 11,356.20 is: 15,671.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,787.57 : 28,686.79 = 11,356.20 : x
  2. Step 2: Convert to fraction form
    20,787.57/28,686.79 = 11,356.20/x
  3. Step 3: Cross multiply
    20,787.57x = 28,686.79 × 11,356.20
  4. Step 4: Simplify right side
    20,787.57x = 325,772,752.77
  5. Step 5: Solve for x
    x = 325,772,752.77/20,787.57
  6. Step 6: Final answer
    x = 15,671.52

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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.