Home / 20,710.78-31,066.17-5,128.41

Finding the Fourth Proportional to 20,710.78, 31,066.17 and 5,128.41

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Solution

The fourth proportional to 20,710.78, 31,066.17 and 5,128.41 is: 7,692.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,710.78 : 31,066.17 = 5,128.41 : x
  2. Step 2: Convert to fraction form
    20,710.78/31,066.17 = 5,128.41/x
  3. Step 3: Cross multiply
    20,710.78x = 31,066.17 × 5,128.41
  4. Step 4: Simplify right side
    20,710.78x = 159,320,056.89
  5. Step 5: Solve for x
    x = 159,320,056.89/20,710.78
  6. Step 6: Final answer
    x = 7,692.62

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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.