Home / 20,564.40-28,378.88-11,132.96

Finding the Fourth Proportional to 20,564.40, 28,378.88 and 11,132.96

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Solution

The fourth proportional to 20,564.40, 28,378.88 and 11,132.96 is: 15,363.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,564.40 : 28,378.88 = 11,132.96 : x
  2. Step 2: Convert to fraction form
    20,564.40/28,378.88 = 11,132.96/x
  3. Step 3: Cross multiply
    20,564.40x = 28,378.88 × 11,132.96
  4. Step 4: Simplify right side
    20,564.40x = 315,940,935.88
  5. Step 5: Solve for x
    x = 315,940,935.88/20,564.40
  6. Step 6: Final answer
    x = 15,363.49

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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.