Home / 20,860.50-28,787.49-11,429.28

Finding the Fourth Proportional to 20,860.50, 28,787.49 and 11,429.28

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Solution

The fourth proportional to 20,860.50, 28,787.49 and 11,429.28 is: 15,772.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,860.50 : 28,787.49 = 11,429.28 : x
  2. Step 2: Convert to fraction form
    20,860.50/28,787.49 = 11,429.28/x
  3. Step 3: Cross multiply
    20,860.50x = 28,787.49 × 11,429.28
  4. Step 4: Simplify right side
    20,860.50x = 329,020,283.71
  5. Step 5: Solve for x
    x = 329,020,283.71/20,860.50
  6. Step 6: Final answer
    x = 15,772.41

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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.