Home / 21,281.67-31,911.42-7,943.70

Finding the Fourth Proportional to 21,281.67, 31,911.42 and 7,943.70

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Solution

The fourth proportional to 21,281.67, 31,911.42 and 7,943.70 is: 11,911.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,281.67 : 31,911.42 = 7,943.70 : x
  2. Step 2: Convert to fraction form
    21,281.67/31,911.42 = 7,943.70/x
  3. Step 3: Cross multiply
    21,281.67x = 31,911.42 × 7,943.70
  4. Step 4: Simplify right side
    21,281.67x = 253,494,736.95
  5. Step 5: Solve for x
    x = 253,494,736.95/21,281.67
  6. Step 6: Final answer
    x = 11,911.41

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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.