Home / 20,715.20-28,587.12-11,283.56

Finding the Fourth Proportional to 20,715.20, 28,587.12 and 11,283.56

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Solution

The fourth proportional to 20,715.20, 28,587.12 and 11,283.56 is: 15,571.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,715.20 : 28,587.12 = 11,283.56 : x
  2. Step 2: Convert to fraction form
    20,715.20/28,587.12 = 11,283.56/x
  3. Step 3: Cross multiply
    20,715.20x = 28,587.12 × 11,283.56
  4. Step 4: Simplify right side
    20,715.20x = 322,564,483.75
  5. Step 5: Solve for x
    x = 322,564,483.75/20,715.20
  6. Step 6: Final answer
    x = 15,571.39

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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.