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Finding the Fourth Proportional to 28,966.22, 39,974 and 16,390.97

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Solution

The fourth proportional to 28,966.22, 39,974 and 16,390.97 is: 22,619.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,966.22 : 39,974 = 16,390.97 : x
  2. Step 2: Convert to fraction form
    28,966.22/39,974 = 16,390.97/x
  3. Step 3: Cross multiply
    28,966.22x = 39,974 × 16,390.97
  4. Step 4: Simplify right side
    28,966.22x = 655,212,634.78
  5. Step 5: Solve for x
    x = 655,212,634.78/28,966.22
  6. Step 6: Final answer
    x = 22,619.89

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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.