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Finding the Fourth Proportional to 18,979.10, 28,468.04 and 8,590.86

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Solution

The fourth proportional to 18,979.10, 28,468.04 and 8,590.86 is: 12,886.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,979.10 : 28,468.04 = 8,590.86 : x
  2. Step 2: Convert to fraction form
    18,979.10/28,468.04 = 8,590.86/x
  3. Step 3: Cross multiply
    18,979.10x = 28,468.04 × 8,590.86
  4. Step 4: Simplify right side
    18,979.10x = 244,564,946.11
  5. Step 5: Solve for x
    x = 244,564,946.11/18,979.10
  6. Step 6: Final answer
    x = 12,886.01

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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.