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Finding the Fourth Proportional to 1,220.63, 1,684.49 and 661.11

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Solution

The fourth proportional to 1,220.63, 1,684.49 and 661.11 is: 912.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,220.63 : 1,684.49 = 661.11 : x
  2. Step 2: Convert to fraction form
    1,220.63/1,684.49 = 661.11/x
  3. Step 3: Cross multiply
    1,220.63x = 1,684.49 × 661.11
  4. Step 4: Simplify right side
    1,220.63x = 1,113,633.18
  5. Step 5: Solve for x
    x = 1,113,633.18/1,220.63
  6. Step 6: Final answer
    x = 912.34

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1.5x scale

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.