Home / 21,270.28-31,905.42-5,687.50

Finding the Fourth Proportional to 21,270.28, 31,905.42 and 5,687.50

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Solution

The fourth proportional to 21,270.28, 31,905.42 and 5,687.50 is: 8,531.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,270.28 : 31,905.42 = 5,687.50 : x
  2. Step 2: Convert to fraction form
    21,270.28/31,905.42 = 5,687.50/x
  3. Step 3: Cross multiply
    21,270.28x = 31,905.42 × 5,687.50
  4. Step 4: Simplify right side
    21,270.28x = 181,462,076.25
  5. Step 5: Solve for x
    x = 181,462,076.25/21,270.28
  6. Step 6: Final answer
    x = 8,531.25

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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.