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Finding the Fourth Proportional to 1,165.66, 1,608.42 and 661.49

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Solution

The fourth proportional to 1,165.66, 1,608.42 and 661.49 is: 912.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,165.66 : 1,608.42 = 661.49 : x
  2. Step 2: Convert to fraction form
    1,165.66/1,608.42 = 661.49/x
  3. Step 3: Cross multiply
    1,165.66x = 1,608.42 × 661.49
  4. Step 4: Simplify right side
    1,165.66x = 1,063,945.70
  5. Step 5: Solve for x
    x = 1,063,945.70/1,165.66
  6. Step 6: Final answer
    x = 912.74

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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.