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Finding the Fourth Proportional to 18,913.44, 28,364.16 and 6,431.24

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Solution

The fourth proportional to 18,913.44, 28,364.16 and 6,431.24 is: 9,644.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,913.44 : 28,364.16 = 6,431.24 : x
  2. Step 2: Convert to fraction form
    18,913.44/28,364.16 = 6,431.24/x
  3. Step 3: Cross multiply
    18,913.44x = 28,364.16 × 6,431.24
  4. Step 4: Simplify right side
    18,913.44x = 182,416,720.36
  5. Step 5: Solve for x
    x = 182,416,720.36/18,913.44
  6. Step 6: Final answer
    x = 9,644.82

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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.