Home / 21,331.89-31,984.12-8,860.51

Finding the Fourth Proportional to 21,331.89, 31,984.12 and 8,860.51

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Solution

The fourth proportional to 21,331.89, 31,984.12 and 8,860.51 is: 13,285.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,331.89 : 31,984.12 = 8,860.51 : x
  2. Step 2: Convert to fraction form
    21,331.89/31,984.12 = 8,860.51/x
  3. Step 3: Cross multiply
    21,331.89x = 31,984.12 × 8,860.51
  4. Step 4: Simplify right side
    21,331.89x = 283,395,615.10
  5. Step 5: Solve for x
    x = 283,395,615.10/21,331.89
  6. Step 6: Final answer
    x = 13,285.07

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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.