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Finding the Fourth Proportional to 15,149.90, 20,905.47 and 11,173.20

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Solution

The fourth proportional to 15,149.90, 20,905.47 and 11,173.20 is: 15,417.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,149.90 : 20,905.47 = 11,173.20 : x
  2. Step 2: Convert to fraction form
    15,149.90/20,905.47 = 11,173.20/x
  3. Step 3: Cross multiply
    15,149.90x = 20,905.47 × 11,173.20
  4. Step 4: Simplify right side
    15,149.90x = 233,580,997.40
  5. Step 5: Solve for x
    x = 233,580,997.40/15,149.90
  6. Step 6: Final answer
    x = 15,417.99

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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.