Home / 21,145.12-31,716.40-7,997.28

Finding the Fourth Proportional to 21,145.12, 31,716.40 and 7,997.28

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Solution

The fourth proportional to 21,145.12, 31,716.40 and 7,997.28 is: 11,995.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,145.12 : 31,716.40 = 7,997.28 : x
  2. Step 2: Convert to fraction form
    21,145.12/31,716.40 = 7,997.28/x
  3. Step 3: Cross multiply
    21,145.12x = 31,716.40 × 7,997.28
  4. Step 4: Simplify right side
    21,145.12x = 253,644,931.39
  5. Step 5: Solve for x
    x = 253,644,931.39/21,145.12
  6. Step 6: Final answer
    x = 11,995.44

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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.