Home / 21,296.11-31,919.95-12,957.76

Finding the Fourth Proportional to 21,296.11, 31,919.95 and 12,957.76

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Solution

The fourth proportional to 21,296.11, 31,919.95 and 12,957.76 is: 19,421.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,296.11 : 31,919.95 = 12,957.76 : x
  2. Step 2: Convert to fraction form
    21,296.11/31,919.95 = 12,957.76/x
  3. Step 3: Cross multiply
    21,296.11x = 31,919.95 × 12,957.76
  4. Step 4: Simplify right side
    21,296.11x = 413,610,826.92
  5. Step 5: Solve for x
    x = 413,610,826.92/21,296.11
  6. Step 6: Final answer
    x = 19,421.90

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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.