Home / 21,009.40-31,520.10-12,691.96

Finding the Fourth Proportional to 21,009.40, 31,520.10 and 12,691.96

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Solution

The fourth proportional to 21,009.40, 31,520.10 and 12,691.96 is: 19,041.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,009.40 : 31,520.10 = 12,691.96 : x
  2. Step 2: Convert to fraction form
    21,009.40/31,520.10 = 12,691.96/x
  3. Step 3: Cross multiply
    21,009.40x = 31,520.10 × 12,691.96
  4. Step 4: Simplify right side
    21,009.40x = 400,051,848.40
  5. Step 5: Solve for x
    x = 400,051,848.40/21,009.40
  6. Step 6: Final answer
    x = 19,041.56

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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.