Home / 20,860.65-28,787.79-11,429.21

Finding the Fourth Proportional to 20,860.65, 28,787.79 and 11,429.21

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Solution

The fourth proportional to 20,860.65, 28,787.79 and 11,429.21 is: 15,772.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,860.65 : 28,787.79 = 11,429.21 : x
  2. Step 2: Convert to fraction form
    20,860.65/28,787.79 = 11,429.21/x
  3. Step 3: Cross multiply
    20,860.65x = 28,787.79 × 11,429.21
  4. Step 4: Simplify right side
    20,860.65x = 329,021,553.41
  5. Step 5: Solve for x
    x = 329,021,553.41/20,860.65
  6. Step 6: Final answer
    x = 15,772.35

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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.