Home / 20,787.06-28,686.10-11,355.69

Finding the Fourth Proportional to 20,787.06, 28,686.10 and 11,355.69

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Solution

The fourth proportional to 20,787.06, 28,686.10 and 11,355.69 is: 15,670.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,787.06 : 28,686.10 = 11,355.69 : x
  2. Step 2: Convert to fraction form
    20,787.06/28,686.10 = 11,355.69/x
  3. Step 3: Cross multiply
    20,787.06x = 28,686.10 × 11,355.69
  4. Step 4: Simplify right side
    20,787.06x = 325,750,559.38
  5. Step 5: Solve for x
    x = 325,750,559.38/20,787.06
  6. Step 6: Final answer
    x = 15,670.83

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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.