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Finding the Fourth Proportional to 18,911.14, 28,350.24 and 7,810.90

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Solution

The fourth proportional to 18,911.14, 28,350.24 and 7,810.90 is: 11,709.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,911.14 : 28,350.24 = 7,810.90 : x
  2. Step 2: Convert to fraction form
    18,911.14/28,350.24 = 7,810.90/x
  3. Step 3: Cross multiply
    18,911.14x = 28,350.24 × 7,810.90
  4. Step 4: Simplify right side
    18,911.14x = 221,440,889.62
  5. Step 5: Solve for x
    x = 221,440,889.62/18,911.14
  6. Step 6: Final answer
    x = 11,709.55

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.