Home / 21,129.72-31,701.21-12,705.92

Finding the Fourth Proportional to 21,129.72, 31,701.21 and 12,705.92

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Solution

The fourth proportional to 21,129.72, 31,701.21 and 12,705.92 is: 19,062.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,129.72 : 31,701.21 = 12,705.92 : x
  2. Step 2: Convert to fraction form
    21,129.72/31,701.21 = 12,705.92/x
  3. Step 3: Cross multiply
    21,129.72x = 31,701.21 × 12,705.92
  4. Step 4: Simplify right side
    21,129.72x = 402,793,149.18
  5. Step 5: Solve for x
    x = 402,793,149.18/21,129.72
  6. Step 6: Final answer
    x = 19,062.87

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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.