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Finding the Fourth Proportional to 28,645.97, 42,958.68 and 9,920.97

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Solution

The fourth proportional to 28,645.97, 42,958.68 and 9,920.97 is: 14,877.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,645.97 : 42,958.68 = 9,920.97 : x
  2. Step 2: Convert to fraction form
    28,645.97/42,958.68 = 9,920.97/x
  3. Step 3: Cross multiply
    28,645.97x = 42,958.68 × 9,920.97
  4. Step 4: Simplify right side
    28,645.97x = 426,191,775.52
  5. Step 5: Solve for x
    x = 426,191,775.52/28,645.97
  6. Step 6: Final answer
    x = 14,877.90

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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.