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Finding the Fourth Proportional to 1,781.46, 2,672.38 and 611.58

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Solution

The fourth proportional to 1,781.46, 2,672.38 and 611.58 is: 917.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,781.46 : 2,672.38 = 611.58 : x
  2. Step 2: Convert to fraction form
    1,781.46/2,672.38 = 611.58/x
  3. Step 3: Cross multiply
    1,781.46x = 2,672.38 × 611.58
  4. Step 4: Simplify right side
    1,781.46x = 1,634,381.51
  5. Step 5: Solve for x
    x = 1,634,381.51/1,781.46
  6. Step 6: Final answer
    x = 917.44

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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.