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Finding the Fourth Proportional to 904.72, 1,248.43 and 668.81

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Solution

The fourth proportional to 904.72, 1,248.43 and 668.81 is: 922.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    904.72 : 1,248.43 = 668.81 : x
  2. Step 2: Convert to fraction form
    904.72/1,248.43 = 668.81/x
  3. Step 3: Cross multiply
    904.72x = 1,248.43 × 668.81
  4. Step 4: Simplify right side
    904.72x = 834,962.47
  5. Step 5: Solve for x
    x = 834,962.47/904.72
  6. Step 6: Final answer
    x = 922.90

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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.