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Finding the Fourth Proportional to 11,187.78, 16,686.72 and 10,990.98

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Solution

The fourth proportional to 11,187.78, 16,686.72 and 10,990.98 is: 16,393.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,187.78 : 16,686.72 = 10,990.98 : x
  2. Step 2: Convert to fraction form
    11,187.78/16,686.72 = 10,990.98/x
  3. Step 3: Cross multiply
    11,187.78x = 16,686.72 × 10,990.98
  4. Step 4: Simplify right side
    11,187.78x = 183,403,405.79
  5. Step 5: Solve for x
    x = 183,403,405.79/11,187.78
  6. Step 6: Final answer
    x = 16,393.19

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.