Home / 20,128.70-27,776.72-11,175.50

Finding the Fourth Proportional to 20,128.70, 27,776.72 and 11,175.50

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Solution

The fourth proportional to 20,128.70, 27,776.72 and 11,175.50 is: 15,421.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,128.70 : 27,776.72 = 11,175.50 : x
  2. Step 2: Convert to fraction form
    20,128.70/27,776.72 = 11,175.50/x
  3. Step 3: Cross multiply
    20,128.70x = 27,776.72 × 11,175.50
  4. Step 4: Simplify right side
    20,128.70x = 310,418,831.74
  5. Step 5: Solve for x
    x = 310,418,831.74/20,128.70
  6. Step 6: Final answer
    x = 15,421.70

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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.