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Finding the Fourth Proportional to 11,686.88, 17,486.40 and 6,989.60

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Solution

The fourth proportional to 11,686.88, 17,486.40 and 6,989.60 is: 10,458.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,686.88 : 17,486.40 = 6,989.60 : x
  2. Step 2: Convert to fraction form
    11,686.88/17,486.40 = 6,989.60/x
  3. Step 3: Cross multiply
    11,686.88x = 17,486.40 × 6,989.60
  4. Step 4: Simplify right side
    11,686.88x = 122,222,941.44
  5. Step 5: Solve for x
    x = 122,222,941.44/11,686.88
  6. Step 6: Final answer
    x = 10,458.13

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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.