Home / 20,406.38-28,159.30-11,455.25

Finding the Fourth Proportional to 20,406.38, 28,159.30 and 11,455.25

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Solution

The fourth proportional to 20,406.38, 28,159.30 and 11,455.25 is: 15,807.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,406.38 : 28,159.30 = 11,455.25 : x
  2. Step 2: Convert to fraction form
    20,406.38/28,159.30 = 11,455.25/x
  3. Step 3: Cross multiply
    20,406.38x = 28,159.30 × 11,455.25
  4. Step 4: Simplify right side
    20,406.38x = 322,571,709.61
  5. Step 5: Solve for x
    x = 322,571,709.61/20,406.38
  6. Step 6: Final answer
    x = 15,807.39

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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.