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Finding the Fourth Proportional to 20,679.60, 31,018.92 and 6,639.60

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Solution

The fourth proportional to 20,679.60, 31,018.92 and 6,639.60 is: 9,959.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,679.60 : 31,018.92 = 6,639.60 : x
  2. Step 2: Convert to fraction form
    20,679.60/31,018.92 = 6,639.60/x
  3. Step 3: Cross multiply
    20,679.60x = 31,018.92 × 6,639.60
  4. Step 4: Simplify right side
    20,679.60x = 205,953,221.23
  5. Step 5: Solve for x
    x = 205,953,221.23/20,679.60
  6. Step 6: Final answer
    x = 9,959.25

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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.