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Finding the Fourth Proportional to 28,775.67, 39,721.22 and 21,282.31

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Solution

The fourth proportional to 28,775.67, 39,721.22 and 21,282.31 is: 29,377.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,775.67 : 39,721.22 = 21,282.31 : x
  2. Step 2: Convert to fraction form
    28,775.67/39,721.22 = 21,282.31/x
  3. Step 3: Cross multiply
    28,775.67x = 39,721.22 × 21,282.31
  4. Step 4: Simplify right side
    28,775.67x = 845,359,317.62
  5. Step 5: Solve for x
    x = 845,359,317.62/28,775.67
  6. Step 6: Final answer
    x = 29,377.57

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.