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Finding the Fourth Proportional to 1,781.71, 2,672.79 and 611.40

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Solution

The fourth proportional to 1,781.71, 2,672.79 and 611.40 is: 917.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,781.71 : 2,672.79 = 611.40 : x
  2. Step 2: Convert to fraction form
    1,781.71/2,672.79 = 611.40/x
  3. Step 3: Cross multiply
    1,781.71x = 2,672.79 × 611.40
  4. Step 4: Simplify right side
    1,781.71x = 1,634,143.81
  5. Step 5: Solve for x
    x = 1,634,143.81/1,781.71
  6. Step 6: Final answer
    x = 917.18

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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.