Home / 21,235.92-31,819.24-12,918.48

Finding the Fourth Proportional to 21,235.92, 31,819.24 and 12,918.48

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Solution

The fourth proportional to 21,235.92, 31,819.24 and 12,918.48 is: 19,356.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,235.92 : 31,819.24 = 12,918.48 : x
  2. Step 2: Convert to fraction form
    21,235.92/31,819.24 = 12,918.48/x
  3. Step 3: Cross multiply
    21,235.92x = 31,819.24 × 12,918.48
  4. Step 4: Simplify right side
    21,235.92x = 411,056,215.56
  5. Step 5: Solve for x
    x = 411,056,215.56/21,235.92
  6. Step 6: Final answer
    x = 19,356.65

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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.