Home / 21,840.72-30,131.64-13,442.64

Finding the Fourth Proportional to 21,840.72, 30,131.64 and 13,442.64

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Solution

The fourth proportional to 21,840.72, 30,131.64 and 13,442.64 is: 18,545.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,840.72 : 30,131.64 = 13,442.64 : x
  2. Step 2: Convert to fraction form
    21,840.72/30,131.64 = 13,442.64/x
  3. Step 3: Cross multiply
    21,840.72x = 30,131.64 × 13,442.64
  4. Step 4: Simplify right side
    21,840.72x = 405,048,789.13
  5. Step 5: Solve for x
    x = 405,048,789.13/21,840.72
  6. Step 6: Final answer
    x = 18,545.58

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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.