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Finding the Fourth Proportional to 1,781.34, 2,670.75 and 684.78

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Solution

The fourth proportional to 1,781.34, 2,670.75 and 684.78 is: 1,026.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,781.34 : 2,670.75 = 684.78 : x
  2. Step 2: Convert to fraction form
    1,781.34/2,670.75 = 684.78/x
  3. Step 3: Cross multiply
    1,781.34x = 2,670.75 × 684.78
  4. Step 4: Simplify right side
    1,781.34x = 1,828,876.19
  5. Step 5: Solve for x
    x = 1,828,876.19/1,781.34
  6. Step 6: Final answer
    x = 1,026.69

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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.