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Finding the Fourth Proportional to 15,081.20, 20,831.28 and 11,587.28

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Solution

The fourth proportional to 15,081.20, 20,831.28 and 11,587.28 is: 16,005.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,081.20 : 20,831.28 = 11,587.28 : x
  2. Step 2: Convert to fraction form
    15,081.20/20,831.28 = 11,587.28/x
  3. Step 3: Cross multiply
    15,081.20x = 20,831.28 × 11,587.28
  4. Step 4: Simplify right side
    15,081.20x = 241,377,874.12
  5. Step 5: Solve for x
    x = 241,377,874.12/15,081.20
  6. Step 6: Final answer
    x = 16,005.22

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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.