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Finding the Fourth Proportional to 18,979.52, 28,479.12 and 13,468.32

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Solution

The fourth proportional to 18,979.52, 28,479.12 and 13,468.32 is: 20,209.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,979.52 : 28,479.12 = 13,468.32 : x
  2. Step 2: Convert to fraction form
    18,979.52/28,479.12 = 13,468.32/x
  3. Step 3: Cross multiply
    18,979.52x = 28,479.12 × 13,468.32
  4. Step 4: Simplify right side
    18,979.52x = 383,565,901.48
  5. Step 5: Solve for x
    x = 383,565,901.48/18,979.52
  6. Step 6: Final answer
    x = 20,209.46

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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.