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Finding the Fourth Proportional to 28,391.90, 42,591.96 and 8,667.89

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Solution

The fourth proportional to 28,391.90, 42,591.96 and 8,667.89 is: 13,003.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,391.90 : 42,591.96 = 8,667.89 : x
  2. Step 2: Convert to fraction form
    28,391.90/42,591.96 = 8,667.89/x
  3. Step 3: Cross multiply
    28,391.90x = 42,591.96 × 8,667.89
  4. Step 4: Simplify right side
    28,391.90x = 369,182,424.16
  5. Step 5: Solve for x
    x = 369,182,424.16/28,391.90
  6. Step 6: Final answer
    x = 13,003.09

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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.