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Finding the Fourth Proportional to 18,911.32, 28,359.78 and 9,043

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Solution

The fourth proportional to 18,911.32, 28,359.78 and 9,043 is: 13,561.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,911.32 : 28,359.78 = 9,043 : x
  2. Step 2: Convert to fraction form
    18,911.32/28,359.78 = 9,043/x
  3. Step 3: Cross multiply
    18,911.32x = 28,359.78 × 9,043
  4. Step 4: Simplify right side
    18,911.32x = 256,457,490.54
  5. Step 5: Solve for x
    x = 256,457,490.54/18,911.32
  6. Step 6: Final answer
    x = 13,561.06

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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.