Home / 20,692.13-31,038.28-5,109.75

Finding the Fourth Proportional to 20,692.13, 31,038.28 and 5,109.75

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Solution

The fourth proportional to 20,692.13, 31,038.28 and 5,109.75 is: 7,664.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,692.13 : 31,038.28 = 5,109.75 : x
  2. Step 2: Convert to fraction form
    20,692.13/31,038.28 = 5,109.75/x
  3. Step 3: Cross multiply
    20,692.13x = 31,038.28 × 5,109.75
  4. Step 4: Simplify right side
    20,692.13x = 158,597,838.46
  5. Step 5: Solve for x
    x = 158,597,838.46/20,692.13
  6. Step 6: Final answer
    x = 7,664.65

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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.