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Finding the Fourth Proportional to 1,165.51, 1,608.21 and 668.05

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Solution

The fourth proportional to 1,165.51, 1,608.21 and 668.05 is: 921.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,165.51 : 1,608.21 = 668.05 : x
  2. Step 2: Convert to fraction form
    1,165.51/1,608.21 = 668.05/x
  3. Step 3: Cross multiply
    1,165.51x = 1,608.21 × 668.05
  4. Step 4: Simplify right side
    1,165.51x = 1,074,364.69
  5. Step 5: Solve for x
    x = 1,074,364.69/1,165.51
  6. Step 6: Final answer
    x = 921.80

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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.