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Finding the Fourth Proportional to 1,093.78, 1,637.40 and 661.78

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Solution

The fourth proportional to 1,093.78, 1,637.40 and 661.78 is: 990.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,093.78 : 1,637.40 = 661.78 : x
  2. Step 2: Convert to fraction form
    1,093.78/1,637.40 = 661.78/x
  3. Step 3: Cross multiply
    1,093.78x = 1,637.40 × 661.78
  4. Step 4: Simplify right side
    1,093.78x = 1,083,598.57
  5. Step 5: Solve for x
    x = 1,083,598.57/1,093.78
  6. Step 6: Final answer
    x = 990.69

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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.