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Finding the Fourth Proportional to 15,679.74, 21,636.99 and 8,605.74

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Solution

The fourth proportional to 15,679.74, 21,636.99 and 8,605.74 is: 11,875.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,679.74 : 21,636.99 = 8,605.74 : x
  2. Step 2: Convert to fraction form
    15,679.74/21,636.99 = 8,605.74/x
  3. Step 3: Cross multiply
    15,679.74x = 21,636.99 × 8,605.74
  4. Step 4: Simplify right side
    15,679.74x = 186,202,310.32
  5. Step 5: Solve for x
    x = 186,202,310.32/15,679.74
  6. Step 6: Final answer
    x = 11,875.34

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.