Home / 21,171.08-31,753.92-7,128.92

Finding the Fourth Proportional to 21,171.08, 31,753.92 and 7,128.92

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Solution

The fourth proportional to 21,171.08, 31,753.92 and 7,128.92 is: 10,692.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,171.08 : 31,753.92 = 7,128.92 : x
  2. Step 2: Convert to fraction form
    21,171.08/31,753.92 = 7,128.92/x
  3. Step 3: Cross multiply
    21,171.08x = 31,753.92 × 7,128.92
  4. Step 4: Simplify right side
    21,171.08x = 226,371,155.37
  5. Step 5: Solve for x
    x = 226,371,155.37/21,171.08
  6. Step 6: Final answer
    x = 10,692.47

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1.5x scale

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.