Home / 21,186.40-31,772.60-7,142.64

Finding the Fourth Proportional to 21,186.40, 31,772.60 and 7,142.64

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Solution

The fourth proportional to 21,186.40, 31,772.60 and 7,142.64 is: 10,711.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,186.40 : 31,772.60 = 7,142.64 : x
  2. Step 2: Convert to fraction form
    21,186.40/31,772.60 = 7,142.64/x
  3. Step 3: Cross multiply
    21,186.40x = 31,772.60 × 7,142.64
  4. Step 4: Simplify right side
    21,186.40x = 226,940,243.66
  5. Step 5: Solve for x
    x = 226,940,243.66/21,186.40
  6. Step 6: Final answer
    x = 10,711.60

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.