Home / 21,137.76-31,678.65-11,255.76

Finding the Fourth Proportional to 21,137.76, 31,678.65 and 11,255.76

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Solution

The fourth proportional to 21,137.76, 31,678.65 and 11,255.76 is: 16,868.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,137.76 : 31,678.65 = 11,255.76 : x
  2. Step 2: Convert to fraction form
    21,137.76/31,678.65 = 11,255.76/x
  3. Step 3: Cross multiply
    21,137.76x = 31,678.65 × 11,255.76
  4. Step 4: Simplify right side
    21,137.76x = 356,567,281.52
  5. Step 5: Solve for x
    x = 356,567,281.52/21,137.76
  6. Step 6: Final answer
    x = 16,868.74

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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.