Home / 10,979.20-15,133.68-8,617.36

Finding the Fourth Proportional to 10,979.20, 15,133.68 and 8,617.36

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Solution

The fourth proportional to 10,979.20, 15,133.68 and 8,617.36 is: 11,878.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,979.20 : 15,133.68 = 8,617.36 : x
  2. Step 2: Convert to fraction form
    10,979.20/15,133.68 = 8,617.36/x
  3. Step 3: Cross multiply
    10,979.20x = 15,133.68 × 8,617.36
  4. Step 4: Simplify right side
    10,979.20x = 130,412,368.68
  5. Step 5: Solve for x
    x = 130,412,368.68/10,979.20
  6. Step 6: Final answer
    x = 11,878.13

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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.