Home / 21,156.37-31,755.90-9,315.41

Finding the Fourth Proportional to 21,156.37, 31,755.90 and 9,315.41

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Solution

The fourth proportional to 21,156.37, 31,755.90 and 9,315.41 is: 13,982.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,156.37 : 31,755.90 = 9,315.41 : x
  2. Step 2: Convert to fraction form
    21,156.37/31,755.90 = 9,315.41/x
  3. Step 3: Cross multiply
    21,156.37x = 31,755.90 × 9,315.41
  4. Step 4: Simplify right side
    21,156.37x = 295,819,331.10
  5. Step 5: Solve for x
    x = 295,819,331.10/21,156.37
  6. Step 6: Final answer
    x = 13,982.52

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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.