Home / 20,930.86-31,395.63-5,135.95

Finding the Fourth Proportional to 20,930.86, 31,395.63 and 5,135.95

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Solution

The fourth proportional to 20,930.86, 31,395.63 and 5,135.95 is: 7,703.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,930.86 : 31,395.63 = 5,135.95 : x
  2. Step 2: Convert to fraction form
    20,930.86/31,395.63 = 5,135.95/x
  3. Step 3: Cross multiply
    20,930.86x = 31,395.63 × 5,135.95
  4. Step 4: Simplify right side
    20,930.86x = 161,246,385.90
  5. Step 5: Solve for x
    x = 161,246,385.90/20,930.86
  6. Step 6: Final answer
    x = 7,703.76

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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.