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Finding the Fourth Proportional to 933.72, 1,289.07 and 646.80

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Solution

The fourth proportional to 933.72, 1,289.07 and 646.80 is: 892.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    933.72 : 1,289.07 = 646.80 : x
  2. Step 2: Convert to fraction form
    933.72/1,289.07 = 646.80/x
  3. Step 3: Cross multiply
    933.72x = 1,289.07 × 646.80
  4. Step 4: Simplify right side
    933.72x = 833,770.48
  5. Step 5: Solve for x
    x = 833,770.48/933.72
  6. Step 6: Final answer
    x = 892.96

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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.