Home / 20,968.85-31,457.90-9,124.48

Finding the Fourth Proportional to 20,968.85, 31,457.90 and 9,124.48

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Solution

The fourth proportional to 20,968.85, 31,457.90 and 9,124.48 is: 13,688.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,968.85 : 31,457.90 = 9,124.48 : x
  2. Step 2: Convert to fraction form
    20,968.85/31,457.90 = 9,124.48/x
  3. Step 3: Cross multiply
    20,968.85x = 31,457.90 × 9,124.48
  4. Step 4: Simplify right side
    20,968.85x = 287,036,979.39
  5. Step 5: Solve for x
    x = 287,036,979.39/20,968.85
  6. Step 6: Final answer
    x = 13,688.73

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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.