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Finding the Fourth Proportional to 11,918.79, 17,866.55 and 5,677.11

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Solution

The fourth proportional to 11,918.79, 17,866.55 and 5,677.11 is: 8,510.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,918.79 : 17,866.55 = 5,677.11 : x
  2. Step 2: Convert to fraction form
    11,918.79/17,866.55 = 5,677.11/x
  3. Step 3: Cross multiply
    11,918.79x = 17,866.55 × 5,677.11
  4. Step 4: Simplify right side
    11,918.79x = 101,430,383.86
  5. Step 5: Solve for x
    x = 101,430,383.86/11,918.79
  6. Step 6: Final answer
    x = 8,510.12

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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.