Home / 20,689.50-31,040.37-11,930.70

Finding the Fourth Proportional to 20,689.50, 31,040.37 and 11,930.70

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Solution

The fourth proportional to 20,689.50, 31,040.37 and 11,930.70 is: 17,899.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,689.50 : 31,040.37 = 11,930.70 : x
  2. Step 2: Convert to fraction form
    20,689.50/31,040.37 = 11,930.70/x
  3. Step 3: Cross multiply
    20,689.50x = 31,040.37 × 11,930.70
  4. Step 4: Simplify right side
    20,689.50x = 370,333,342.36
  5. Step 5: Solve for x
    x = 370,333,342.36/20,689.50
  6. Step 6: Final answer
    x = 17,899.58

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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.