Home / 20,787.56-28,670.62-18,400.08

Finding the Fourth Proportional to 20,787.56, 28,670.62 and 18,400.08

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Solution

The fourth proportional to 20,787.56, 28,670.62 and 18,400.08 is: 25,377.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,787.56 : 28,670.62 = 18,400.08 : x
  2. Step 2: Convert to fraction form
    20,787.56/28,670.62 = 18,400.08/x
  3. Step 3: Cross multiply
    20,787.56x = 28,670.62 × 18,400.08
  4. Step 4: Simplify right side
    20,787.56x = 527,541,701.65
  5. Step 5: Solve for x
    x = 527,541,701.65/20,787.56
  6. Step 6: Final answer
    x = 25,377.76

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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.