Home / 20,787.67-28,686.54-11,356.30

Finding the Fourth Proportional to 20,787.67, 28,686.54 and 11,356.30

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Solution

The fourth proportional to 20,787.67, 28,686.54 and 11,356.30 is: 15,671.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,787.67 : 28,686.54 = 11,356.30 : x
  2. Step 2: Convert to fraction form
    20,787.67/28,686.54 = 11,356.30/x
  3. Step 3: Cross multiply
    20,787.67x = 28,686.54 × 11,356.30
  4. Step 4: Simplify right side
    20,787.67x = 325,772,954.20
  5. Step 5: Solve for x
    x = 325,772,954.20/20,787.67
  6. Step 6: Final answer
    x = 15,671.45

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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.