Home / 20,710.88-31,066.31-5,128.50

Finding the Fourth Proportional to 20,710.88, 31,066.31 and 5,128.50

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Solution

The fourth proportional to 20,710.88, 31,066.31 and 5,128.50 is: 7,692.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,710.88 : 31,066.31 = 5,128.50 : x
  2. Step 2: Convert to fraction form
    20,710.88/31,066.31 = 5,128.50/x
  3. Step 3: Cross multiply
    20,710.88x = 31,066.31 × 5,128.50
  4. Step 4: Simplify right side
    20,710.88x = 159,323,583.66
  5. Step 5: Solve for x
    x = 159,323,583.66/20,710.88
  6. Step 6: Final answer
    x = 7,692.75

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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.