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Finding the Fourth Proportional to 1,220.55, 1,684.36 and 661.03

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Solution

The fourth proportional to 1,220.55, 1,684.36 and 661.03 is: 912.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,220.55 : 1,684.36 = 661.03 : x
  2. Step 2: Convert to fraction form
    1,220.55/1,684.36 = 661.03/x
  3. Step 3: Cross multiply
    1,220.55x = 1,684.36 × 661.03
  4. Step 4: Simplify right side
    1,220.55x = 1,113,408.28
  5. Step 5: Solve for x
    x = 1,113,408.28/1,220.55
  6. Step 6: Final answer
    x = 912.22

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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.