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Finding the Fourth Proportional to 15,151.90, 20,908.23 and 11,175.20

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Solution

The fourth proportional to 15,151.90, 20,908.23 and 11,175.20 is: 15,420.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,151.90 : 20,908.23 = 11,175.20 : x
  2. Step 2: Convert to fraction form
    15,151.90/20,908.23 = 11,175.20/x
  3. Step 3: Cross multiply
    15,151.90x = 20,908.23 × 11,175.20
  4. Step 4: Simplify right side
    15,151.90x = 233,653,651.90
  5. Step 5: Solve for x
    x = 233,653,651.90/15,151.90
  6. Step 6: Final answer
    x = 15,420.75

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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.