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Finding the Fourth Proportional to 9,186.90, 13,764.15 and 7,890.90

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Solution

The fourth proportional to 9,186.90, 13,764.15 and 7,890.90 is: 11,822.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,186.90 : 13,764.15 = 7,890.90 : x
  2. Step 2: Convert to fraction form
    9,186.90/13,764.15 = 7,890.90/x
  3. Step 3: Cross multiply
    9,186.90x = 13,764.15 × 7,890.90
  4. Step 4: Simplify right side
    9,186.90x = 108,611,531.24
  5. Step 5: Solve for x
    x = 108,611,531.24/9,186.90
  6. Step 6: Final answer
    x = 11,822.44

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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.