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Finding the Fourth Proportional to 28,379.97, 42,570.69 and 8,658.47

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Solution

The fourth proportional to 28,379.97, 42,570.69 and 8,658.47 is: 12,987.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,379.97 : 42,570.69 = 8,658.47 : x
  2. Step 2: Convert to fraction form
    28,379.97/42,570.69 = 8,658.47/x
  3. Step 3: Cross multiply
    28,379.97x = 42,570.69 × 8,658.47
  4. Step 4: Simplify right side
    28,379.97x = 368,597,020.82
  5. Step 5: Solve for x
    x = 368,597,020.82/28,379.97
  6. Step 6: Final answer
    x = 12,987.93

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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.