Home / 15,679.36-21,636.64-8,605.20

Finding the Fourth Proportional to 15,679.36, 21,636.64 and 8,605.20

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Solution

The fourth proportional to 15,679.36, 21,636.64 and 8,605.20 is: 11,874.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,679.36 : 21,636.64 = 8,605.20 : x
  2. Step 2: Convert to fraction form
    15,679.36/21,636.64 = 8,605.20/x
  3. Step 3: Cross multiply
    15,679.36x = 21,636.64 × 8,605.20
  4. Step 4: Simplify right side
    15,679.36x = 186,187,614.53
  5. Step 5: Solve for x
    x = 186,187,614.53/15,679.36
  6. Step 6: Final answer
    x = 11,874.69

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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.