Home / 15,815.85-21,825.28-8,742.39

Finding the Fourth Proportional to 15,815.85, 21,825.28 and 8,742.39

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Solution

The fourth proportional to 15,815.85, 21,825.28 and 8,742.39 is: 12,064.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,815.85 : 21,825.28 = 8,742.39 : x
  2. Step 2: Convert to fraction form
    15,815.85/21,825.28 = 8,742.39/x
  3. Step 3: Cross multiply
    15,815.85x = 21,825.28 × 8,742.39
  4. Step 4: Simplify right side
    15,815.85x = 190,805,109.62
  5. Step 5: Solve for x
    x = 190,805,109.62/15,815.85
  6. Step 6: Final answer
    x = 12,064.17

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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.