Home / 21,190.14-31,772.52-7,149.86

Finding the Fourth Proportional to 21,190.14, 31,772.52 and 7,149.86

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Solution

The fourth proportional to 21,190.14, 31,772.52 and 7,149.86 is: 10,720.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,190.14 : 31,772.52 = 7,149.86 : x
  2. Step 2: Convert to fraction form
    21,190.14/31,772.52 = 7,149.86/x
  3. Step 3: Cross multiply
    21,190.14x = 31,772.52 × 7,149.86
  4. Step 4: Simplify right side
    21,190.14x = 227,168,875.24
  5. Step 5: Solve for x
    x = 227,168,875.24/21,190.14
  6. Step 6: Final answer
    x = 10,720.50

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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.