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Finding the Fourth Proportional to 28,374.62, 42,561.81 and 8,653.12

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Solution

The fourth proportional to 28,374.62, 42,561.81 and 8,653.12 is: 12,979.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,374.62 : 42,561.81 = 8,653.12 : x
  2. Step 2: Convert to fraction form
    28,374.62/42,561.81 = 8,653.12/x
  3. Step 3: Cross multiply
    28,374.62x = 42,561.81 × 8,653.12
  4. Step 4: Simplify right side
    28,374.62x = 368,292,193.27
  5. Step 5: Solve for x
    x = 368,292,193.27/28,374.62
  6. Step 6: Final answer
    x = 12,979.64

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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.