Home / 20,923.52-31,385.32-5,128.62

Finding the Fourth Proportional to 20,923.52, 31,385.32 and 5,128.62

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Solution

The fourth proportional to 20,923.52, 31,385.32 and 5,128.62 is: 7,692.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,923.52 : 31,385.32 = 5,128.62 : x
  2. Step 2: Convert to fraction form
    20,923.52/31,385.32 = 5,128.62/x
  3. Step 3: Cross multiply
    20,923.52x = 31,385.32 × 5,128.62
  4. Step 4: Simplify right side
    20,923.52x = 160,963,278.19
  5. Step 5: Solve for x
    x = 160,963,278.19/20,923.52
  6. Step 6: Final answer
    x = 7,692.94

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.