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Finding the Fourth Proportional to 933.62, 1,287.23 and 712.22

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Solution

The fourth proportional to 933.62, 1,287.23 and 712.22 is: 981.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    933.62 : 1,287.23 = 712.22 : x
  2. Step 2: Convert to fraction form
    933.62/1,287.23 = 712.22/x
  3. Step 3: Cross multiply
    933.62x = 1,287.23 × 712.22
  4. Step 4: Simplify right side
    933.62x = 916,780.95
  5. Step 5: Solve for x
    x = 916,780.95/933.62
  6. Step 6: Final answer
    x = 981.97

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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.