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Finding the Fourth Proportional to 28,357.81, 42,542.87 and 8,635.85

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Solution

The fourth proportional to 28,357.81, 42,542.87 and 8,635.85 is: 12,955.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,357.81 : 42,542.87 = 8,635.85 : x
  2. Step 2: Convert to fraction form
    28,357.81/42,542.87 = 8,635.85/x
  3. Step 3: Cross multiply
    28,357.81x = 42,542.87 × 8,635.85
  4. Step 4: Simplify right side
    28,357.81x = 367,393,843.89
  5. Step 5: Solve for x
    x = 367,393,843.89/28,357.81
  6. Step 6: Final answer
    x = 12,955.65

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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.