Home / 11,158.16-15,399.48-7,128.70

Finding the Fourth Proportional to 11,158.16, 15,399.48 and 7,128.70

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Solution

The fourth proportional to 11,158.16, 15,399.48 and 7,128.70 is: 9,838.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,158.16 : 15,399.48 = 7,128.70 : x
  2. Step 2: Convert to fraction form
    11,158.16/15,399.48 = 7,128.70/x
  3. Step 3: Cross multiply
    11,158.16x = 15,399.48 × 7,128.70
  4. Step 4: Simplify right side
    11,158.16x = 109,778,273.08
  5. Step 5: Solve for x
    x = 109,778,273.08/11,158.16
  6. Step 6: Final answer
    x = 9,838.38

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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.