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Finding the Fourth Proportional to 1,781.78, 2,672.64 and 627.50

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Solution

The fourth proportional to 1,781.78, 2,672.64 and 627.50 is: 941.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,781.78 : 2,672.64 = 627.50 : x
  2. Step 2: Convert to fraction form
    1,781.78/2,672.64 = 627.50/x
  3. Step 3: Cross multiply
    1,781.78x = 2,672.64 × 627.50
  4. Step 4: Simplify right side
    1,781.78x = 1,677,081.60
  5. Step 5: Solve for x
    x = 1,677,081.60/1,781.78
  6. Step 6: Final answer
    x = 941.24

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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.