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Finding the Fourth Proportional to 1,221.48, 1,685.64 and 661.94

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Solution

The fourth proportional to 1,221.48, 1,685.64 and 661.94 is: 913.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,221.48 : 1,685.64 = 661.94 : x
  2. Step 2: Convert to fraction form
    1,221.48/1,685.64 = 661.94/x
  3. Step 3: Cross multiply
    1,221.48x = 1,685.64 × 661.94
  4. Step 4: Simplify right side
    1,221.48x = 1,115,792.54
  5. Step 5: Solve for x
    x = 1,115,792.54/1,221.48
  6. Step 6: Final answer
    x = 913.48

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.