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Finding the Fourth Proportional to 1,061.91, 1,464.08 and 668.25

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Solution

The fourth proportional to 1,061.91, 1,464.08 and 668.25 is: 921.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,061.91 : 1,464.08 = 668.25 : x
  2. Step 2: Convert to fraction form
    1,061.91/1,464.08 = 668.25/x
  3. Step 3: Cross multiply
    1,061.91x = 1,464.08 × 668.25
  4. Step 4: Simplify right side
    1,061.91x = 978,368.12
  5. Step 5: Solve for x
    x = 978,368.12/1,061.91
  6. Step 6: Final answer
    x = 921.33

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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.