Home / 20,939.76-31,409.64-7,098.48

Finding the Fourth Proportional to 20,939.76, 31,409.64 and 7,098.48

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Solution

The fourth proportional to 20,939.76, 31,409.64 and 7,098.48 is: 10,647.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,939.76 : 31,409.64 = 7,098.48 : x
  2. Step 2: Convert to fraction form
    20,939.76/31,409.64 = 7,098.48/x
  3. Step 3: Cross multiply
    20,939.76x = 31,409.64 × 7,098.48
  4. Step 4: Simplify right side
    20,939.76x = 222,960,701.35
  5. Step 5: Solve for x
    x = 222,960,701.35/20,939.76
  6. Step 6: Final answer
    x = 10,647.72

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1.5x scale

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.