Home / 20,721.54-28,594.94-11,289.90

Finding the Fourth Proportional to 20,721.54, 28,594.94 and 11,289.90

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Solution

The fourth proportional to 20,721.54, 28,594.94 and 11,289.90 is: 15,579.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,721.54 : 28,594.94 = 11,289.90 : x
  2. Step 2: Convert to fraction form
    20,721.54/28,594.94 = 11,289.90/x
  3. Step 3: Cross multiply
    20,721.54x = 28,594.94 × 11,289.90
  4. Step 4: Simplify right side
    20,721.54x = 322,834,013.11
  5. Step 5: Solve for x
    x = 322,834,013.11/20,721.54
  6. Step 6: Final answer
    x = 15,579.63

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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.