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Finding the Fourth Proportional to 1,756.72, 2,635.09 and 661.17

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Solution

The fourth proportional to 1,756.72, 2,635.09 and 661.17 is: 991.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,756.72 : 2,635.09 = 661.17 : x
  2. Step 2: Convert to fraction form
    1,756.72/2,635.09 = 661.17/x
  3. Step 3: Cross multiply
    1,756.72x = 2,635.09 × 661.17
  4. Step 4: Simplify right side
    1,756.72x = 1,742,250.68
  5. Step 5: Solve for x
    x = 1,742,250.68/1,756.72
  6. Step 6: Final answer
    x = 991.76

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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.