Home / 20,917.72-31,378.02-8,437.85

Finding the Fourth Proportional to 20,917.72, 31,378.02 and 8,437.85

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Solution

The fourth proportional to 20,917.72, 31,378.02 and 8,437.85 is: 12,657.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,917.72 : 31,378.02 = 8,437.85 : x
  2. Step 2: Convert to fraction form
    20,917.72/31,378.02 = 8,437.85/x
  3. Step 3: Cross multiply
    20,917.72x = 31,378.02 × 8,437.85
  4. Step 4: Simplify right side
    20,917.72x = 264,762,826.98
  5. Step 5: Solve for x
    x = 264,762,826.98/20,917.72
  6. Step 6: Final answer
    x = 12,657.35

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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.