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Finding the Fourth Proportional to 18,913.12, 28,374 and 9,054.88

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Solution

The fourth proportional to 18,913.12, 28,374 and 9,054.88 is: 13,584.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,913.12 : 28,374 = 9,054.88 : x
  2. Step 2: Convert to fraction form
    18,913.12/28,374 = 9,054.88/x
  3. Step 3: Cross multiply
    18,913.12x = 28,374 × 9,054.88
  4. Step 4: Simplify right side
    18,913.12x = 256,923,165.12
  5. Step 5: Solve for x
    x = 256,923,165.12/18,913.12
  6. Step 6: Final answer
    x = 13,584.39

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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.