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Finding the Fourth Proportional to 20,687.26, 31,030.90 and 5,104.90

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Solution

The fourth proportional to 20,687.26, 31,030.90 and 5,104.90 is: 7,657.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,687.26 : 31,030.90 = 5,104.90 : x
  2. Step 2: Convert to fraction form
    20,687.26/31,030.90 = 5,104.90/x
  3. Step 3: Cross multiply
    20,687.26x = 31,030.90 × 5,104.90
  4. Step 4: Simplify right side
    20,687.26x = 158,409,641.41
  5. Step 5: Solve for x
    x = 158,409,641.41/20,687.26
  6. Step 6: Final answer
    x = 7,657.35

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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.