Home / 11,979.95-16,516.20-8,390.08

Finding the Fourth Proportional to 11,979.95, 16,516.20 and 8,390.08

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Solution

The fourth proportional to 11,979.95, 16,516.20 and 8,390.08 is: 11,567.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,979.95 : 16,516.20 = 8,390.08 : x
  2. Step 2: Convert to fraction form
    11,979.95/16,516.20 = 8,390.08/x
  3. Step 3: Cross multiply
    11,979.95x = 16,516.20 × 8,390.08
  4. Step 4: Simplify right side
    11,979.95x = 138,572,229.47
  5. Step 5: Solve for x
    x = 138,572,229.47/11,979.95
  6. Step 6: Final answer
    x = 11,567.01

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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.