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Finding the Fourth Proportional to 18,967.61, 28,464.12 and 7,874.31

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Solution

The fourth proportional to 18,967.61, 28,464.12 and 7,874.31 is: 11,816.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,967.61 : 28,464.12 = 7,874.31 : x
  2. Step 2: Convert to fraction form
    18,967.61/28,464.12 = 7,874.31/x
  3. Step 3: Cross multiply
    18,967.61x = 28,464.12 × 7,874.31
  4. Step 4: Simplify right side
    18,967.61x = 224,135,275.23
  5. Step 5: Solve for x
    x = 224,135,275.23/18,967.61
  6. Step 6: Final answer
    x = 11,816.74

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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.