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Finding the Fourth Proportional to 8,390.30, 11,590.42 and 7,947.44

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Solution

The fourth proportional to 8,390.30, 11,590.42 and 7,947.44 is: 10,978.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,390.30 : 11,590.42 = 7,947.44 : x
  2. Step 2: Convert to fraction form
    8,390.30/11,590.42 = 7,947.44/x
  3. Step 3: Cross multiply
    8,390.30x = 11,590.42 × 7,947.44
  4. Step 4: Simplify right side
    8,390.30x = 92,114,167.52
  5. Step 5: Solve for x
    x = 92,114,167.52/8,390.30
  6. Step 6: Final answer
    x = 10,978.65

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.