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Finding the Fourth Proportional to 12,155.67, 16,774.92 and 7,122.87

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Solution

The fourth proportional to 12,155.67, 16,774.92 and 7,122.87 is: 9,829.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,155.67 : 16,774.92 = 7,122.87 : x
  2. Step 2: Convert to fraction form
    12,155.67/16,774.92 = 7,122.87/x
  3. Step 3: Cross multiply
    12,155.67x = 16,774.92 × 7,122.87
  4. Step 4: Simplify right side
    12,155.67x = 119,485,574.42
  5. Step 5: Solve for x
    x = 119,485,574.42/12,155.67
  6. Step 6: Final answer
    x = 9,829.62

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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.