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Finding the Fourth Proportional to 20,896.80, 31,498.80 and 19,692.24

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Solution

The fourth proportional to 20,896.80, 31,498.80 and 19,692.24 is: 29,683.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,896.80 : 31,498.80 = 19,692.24 : x
  2. Step 2: Convert to fraction form
    20,896.80/31,498.80 = 19,692.24/x
  3. Step 3: Cross multiply
    20,896.80x = 31,498.80 × 19,692.24
  4. Step 4: Simplify right side
    20,896.80x = 620,281,929.31
  5. Step 5: Solve for x
    x = 620,281,929.31/20,896.80
  6. Step 6: Final answer
    x = 29,683.11

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.