Home / 21,705.78-29,953.86-12,145.68

Finding the Fourth Proportional to 21,705.78, 29,953.86 and 12,145.68

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Solution

The fourth proportional to 21,705.78, 29,953.86 and 12,145.68 is: 16,760.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,705.78 : 29,953.86 = 12,145.68 : x
  2. Step 2: Convert to fraction form
    21,705.78/29,953.86 = 12,145.68/x
  3. Step 3: Cross multiply
    21,705.78x = 29,953.86 × 12,145.68
  4. Step 4: Simplify right side
    21,705.78x = 363,809,998.32
  5. Step 5: Solve for x
    x = 363,809,998.32/21,705.78
  6. Step 6: Final answer
    x = 16,760.97

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.