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Finding the Fourth Proportional to 18,838.20, 28,265.40 and 8,972.40

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Solution

The fourth proportional to 18,838.20, 28,265.40 and 8,972.40 is: 13,462.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,838.20 : 28,265.40 = 8,972.40 : x
  2. Step 2: Convert to fraction form
    18,838.20/28,265.40 = 8,972.40/x
  3. Step 3: Cross multiply
    18,838.20x = 28,265.40 × 8,972.40
  4. Step 4: Simplify right side
    18,838.20x = 253,608,474.96
  5. Step 5: Solve for x
    x = 253,608,474.96/18,838.20
  6. Step 6: Final answer
    x = 13,462.46

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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.