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Finding the Fourth Proportional to 1,756.78, 2,635.30 and 661.12

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Solution

The fourth proportional to 1,756.78, 2,635.30 and 661.12 is: 991.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,756.78 : 2,635.30 = 661.12 : x
  2. Step 2: Convert to fraction form
    1,756.78/2,635.30 = 661.12/x
  3. Step 3: Cross multiply
    1,756.78x = 2,635.30 × 661.12
  4. Step 4: Simplify right side
    1,756.78x = 1,742,249.54
  5. Step 5: Solve for x
    x = 1,742,249.54/1,756.78
  6. Step 6: Final answer
    x = 991.73

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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.