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Finding the Fourth Proportional to 8,979.78, 12,392.79 and 5,204.16

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Solution

The fourth proportional to 8,979.78, 12,392.79 and 5,204.16 is: 7,182.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,979.78 : 12,392.79 = 5,204.16 : x
  2. Step 2: Convert to fraction form
    8,979.78/12,392.79 = 5,204.16/x
  3. Step 3: Cross multiply
    8,979.78x = 12,392.79 × 5,204.16
  4. Step 4: Simplify right side
    8,979.78x = 64,494,062.01
  5. Step 5: Solve for x
    x = 64,494,062.01/8,979.78
  6. Step 6: Final answer
    x = 7,182.14

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.