Home / 21,428.08-29,540.31-15,752.81

Finding the Fourth Proportional to 21,428.08, 29,540.31 and 15,752.81

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Solution

The fourth proportional to 21,428.08, 29,540.31 and 15,752.81 is: 21,716.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,428.08 : 29,540.31 = 15,752.81 : x
  2. Step 2: Convert to fraction form
    21,428.08/29,540.31 = 15,752.81/x
  3. Step 3: Cross multiply
    21,428.08x = 29,540.31 × 15,752.81
  4. Step 4: Simplify right side
    21,428.08x = 465,342,890.77
  5. Step 5: Solve for x
    x = 465,342,890.77/21,428.08
  6. Step 6: Final answer
    x = 21,716.50

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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.