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Finding the Fourth Proportional to 18,957.11, 28,435.68 and 7,856.37

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Solution

The fourth proportional to 18,957.11, 28,435.68 and 7,856.37 is: 11,784.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,957.11 : 28,435.68 = 7,856.37 : x
  2. Step 2: Convert to fraction form
    18,957.11/28,435.68 = 7,856.37/x
  3. Step 3: Cross multiply
    18,957.11x = 28,435.68 × 7,856.37
  4. Step 4: Simplify right side
    18,957.11x = 223,401,223.28
  5. Step 5: Solve for x
    x = 223,401,223.28/18,957.11
  6. Step 6: Final answer
    x = 11,784.56

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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.