Home / 20,409.90-28,164.12-11,455.68

Finding the Fourth Proportional to 20,409.90, 28,164.12 and 11,455.68

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Solution

The fourth proportional to 20,409.90, 28,164.12 and 11,455.68 is: 15,807.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,409.90 : 28,164.12 = 11,455.68 : x
  2. Step 2: Convert to fraction form
    20,409.90/28,164.12 = 11,455.68/x
  3. Step 3: Cross multiply
    20,409.90x = 28,164.12 × 11,455.68
  4. Step 4: Simplify right side
    20,409.90x = 322,639,146.20
  5. Step 5: Solve for x
    x = 322,639,146.20/20,409.90
  6. Step 6: Final answer
    x = 15,807.97

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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.