Home / 21,012.75-31,497.86-13,621.90

Finding the Fourth Proportional to 21,012.75, 31,497.86 and 13,621.90

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Solution

The fourth proportional to 21,012.75, 31,497.86 and 13,621.90 is: 20,419.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,012.75 : 31,497.86 = 13,621.90 : x
  2. Step 2: Convert to fraction form
    21,012.75/31,497.86 = 13,621.90/x
  3. Step 3: Cross multiply
    21,012.75x = 31,497.86 × 13,621.90
  4. Step 4: Simplify right side
    21,012.75x = 429,060,631.02
  5. Step 5: Solve for x
    x = 429,060,631.02/21,012.75
  6. Step 6: Final answer
    x = 20,419.06

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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.