Home / 20,787.09-28,686.18-11,355.66

Finding the Fourth Proportional to 20,787.09, 28,686.18 and 11,355.66

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Solution

The fourth proportional to 20,787.09, 28,686.18 and 11,355.66 is: 15,670.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,787.09 : 28,686.18 = 11,355.66 : x
  2. Step 2: Convert to fraction form
    20,787.09/28,686.18 = 11,355.66/x
  3. Step 3: Cross multiply
    20,787.09x = 28,686.18 × 11,355.66
  4. Step 4: Simplify right side
    20,787.09x = 325,750,506.78
  5. Step 5: Solve for x
    x = 325,750,506.78/20,787.09
  6. Step 6: Final answer
    x = 15,670.81

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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.