Home / 20,400.80-28,152-11,446.72

Finding the Fourth Proportional to 20,400.80, 28,152 and 11,446.72

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Solution

The fourth proportional to 20,400.80, 28,152 and 11,446.72 is: 15,795.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,400.80 : 28,152 = 11,446.72 : x
  2. Step 2: Convert to fraction form
    20,400.80/28,152 = 11,446.72/x
  3. Step 3: Cross multiply
    20,400.80x = 28,152 × 11,446.72
  4. Step 4: Simplify right side
    20,400.80x = 322,248,061.44
  5. Step 5: Solve for x
    x = 322,248,061.44/20,400.80
  6. Step 6: Final answer
    x = 15,795.85

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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.