Home / 21,315.12-29,428.56-13,764.84

Finding the Fourth Proportional to 21,315.12, 29,428.56 and 13,764.84

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Solution

The fourth proportional to 21,315.12, 29,428.56 and 13,764.84 is: 19,004.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,315.12 : 29,428.56 = 13,764.84 : x
  2. Step 2: Convert to fraction form
    21,315.12/29,428.56 = 13,764.84/x
  3. Step 3: Cross multiply
    21,315.12x = 29,428.56 × 13,764.84
  4. Step 4: Simplify right side
    21,315.12x = 405,079,419.83
  5. Step 5: Solve for x
    x = 405,079,419.83/21,315.12
  6. Step 6: Final answer
    x = 19,004.32

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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.