Home / 20,795.31-31,116.29-12,480.39

Finding the Fourth Proportional to 20,795.31, 31,116.29 and 12,480.39

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Solution

The fourth proportional to 20,795.31, 31,116.29 and 12,480.39 is: 18,674.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,795.31 : 31,116.29 = 12,480.39 : x
  2. Step 2: Convert to fraction form
    20,795.31/31,116.29 = 12,480.39/x
  3. Step 3: Cross multiply
    20,795.31x = 31,116.29 × 12,480.39
  4. Step 4: Simplify right side
    20,795.31x = 388,343,372.15
  5. Step 5: Solve for x
    x = 388,343,372.15/20,795.31
  6. Step 6: Final answer
    x = 18,674.57

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1.5x scale

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.