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Finding the Fourth Proportional to 1,611, 2,221.29 and 1,256.53

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Solution

The fourth proportional to 1,611, 2,221.29 and 1,256.53 is: 1,732.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,611 : 2,221.29 = 1,256.53 : x
  2. Step 2: Convert to fraction form
    1,611/2,221.29 = 1,256.53/x
  3. Step 3: Cross multiply
    1,611x = 2,221.29 × 1,256.53
  4. Step 4: Simplify right side
    1,611x = 2,791,117.52
  5. Step 5: Solve for x
    x = 2,791,117.52/1,611
  6. Step 6: Final answer
    x = 1,732.54

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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.