Home / 20,640.17-28,482.87-11,688.51

Finding the Fourth Proportional to 20,640.17, 28,482.87 and 11,688.51

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Solution

The fourth proportional to 20,640.17, 28,482.87 and 11,688.51 is: 16,129.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,640.17 : 28,482.87 = 11,688.51 : x
  2. Step 2: Convert to fraction form
    20,640.17/28,482.87 = 11,688.51/x
  3. Step 3: Cross multiply
    20,640.17x = 28,482.87 × 11,688.51
  4. Step 4: Simplify right side
    20,640.17x = 332,922,310.82
  5. Step 5: Solve for x
    x = 332,922,310.82/20,640.17
  6. Step 6: Final answer
    x = 16,129.83

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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.