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Finding the Fourth Proportional to 1,611, 2,223.20 and 875

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Solution

The fourth proportional to 1,611, 2,223.20 and 875 is: 1,207.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,611 : 2,223.20 = 875 : x
  2. Step 2: Convert to fraction form
    1,611/2,223.20 = 875/x
  3. Step 3: Cross multiply
    1,611x = 2,223.20 × 875
  4. Step 4: Simplify right side
    1,611x = 1,945,300.00
  5. Step 5: Solve for x
    x = 1,945,300.00/1,611
  6. Step 6: Final answer
    x = 1,207.51

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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.