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Finding the Fourth Proportional to 668.56, 921.36 and 654.16

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Solution

The fourth proportional to 668.56, 921.36 and 654.16 is: 901.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    668.56 : 921.36 = 654.16 : x
  2. Step 2: Convert to fraction form
    668.56/921.36 = 654.16/x
  3. Step 3: Cross multiply
    668.56x = 921.36 × 654.16
  4. Step 4: Simplify right side
    668.56x = 602,716.86
  5. Step 5: Solve for x
    x = 602,716.86/668.56
  6. Step 6: Final answer
    x = 901.51

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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.