Home / 1,208.85-1,669.79-999.87

Finding the Fourth Proportional to 1,208.85, 1,669.79 and 999.87

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Solution

The fourth proportional to 1,208.85, 1,669.79 and 999.87 is: 1,381.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,208.85 : 1,669.79 = 999.87 : x
  2. Step 2: Convert to fraction form
    1,208.85/1,669.79 = 999.87/x
  3. Step 3: Cross multiply
    1,208.85x = 1,669.79 × 999.87
  4. Step 4: Simplify right side
    1,208.85x = 1,669,567.93
  5. Step 5: Solve for x
    x = 1,669,567.93/1,208.85
  6. Step 6: Final answer
    x = 1,381.12

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.