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Finding the Fourth Proportional to 28,331, 42,661.82 and 20,987.54

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Solution

The fourth proportional to 28,331, 42,661.82 and 20,987.54 is: 31,603.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,331 : 42,661.82 = 20,987.54 : x
  2. Step 2: Convert to fraction form
    28,331/42,661.82 = 20,987.54/x
  3. Step 3: Cross multiply
    28,331x = 42,661.82 × 20,987.54
  4. Step 4: Simplify right side
    28,331x = 895,366,653.72
  5. Step 5: Solve for x
    x = 895,366,653.72/28,331
  6. Step 6: Final answer
    x = 31,603.78

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.