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Finding the Fourth Proportional to 11,777.80, 17,666.70 and 9,185.80

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Solution

The fourth proportional to 11,777.80, 17,666.70 and 9,185.80 is: 13,778.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,777.80 : 17,666.70 = 9,185.80 : x
  2. Step 2: Convert to fraction form
    11,777.80/17,666.70 = 9,185.80/x
  3. Step 3: Cross multiply
    11,777.80x = 17,666.70 × 9,185.80
  4. Step 4: Simplify right side
    11,777.80x = 162,282,772.86
  5. Step 5: Solve for x
    x = 162,282,772.86/11,777.80
  6. Step 6: Final answer
    x = 13,778.70

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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.