Home / 21,225.28-31,851.28-11,871.42

Finding the Fourth Proportional to 21,225.28, 31,851.28 and 11,871.42

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Solution

The fourth proportional to 21,225.28, 31,851.28 and 11,871.42 is: 17,814.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,225.28 : 31,851.28 = 11,871.42 : x
  2. Step 2: Convert to fraction form
    21,225.28/31,851.28 = 11,871.42/x
  3. Step 3: Cross multiply
    21,225.28x = 31,851.28 × 11,871.42
  4. Step 4: Simplify right side
    21,225.28x = 378,119,922.42
  5. Step 5: Solve for x
    x = 378,119,922.42/21,225.28
  6. Step 6: Final answer
    x = 17,814.60

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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.