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Finding the Fourth Proportional to 20,699.26, 31,048.90 and 5,116.90

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Solution

The fourth proportional to 20,699.26, 31,048.90 and 5,116.90 is: 7,675.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,699.26 : 31,048.90 = 5,116.90 : x
  2. Step 2: Convert to fraction form
    20,699.26/31,048.90 = 5,116.90/x
  3. Step 3: Cross multiply
    20,699.26x = 31,048.90 × 5,116.90
  4. Step 4: Simplify right side
    20,699.26x = 158,874,116.41
  5. Step 5: Solve for x
    x = 158,874,116.41/20,699.26
  6. Step 6: Final answer
    x = 7,675.35

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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.