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Finding the Fourth Proportional to 933.23, 1,287.91 and 513.67

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Solution

The fourth proportional to 933.23, 1,287.91 and 513.67 is: 708.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    933.23 : 1,287.91 = 513.67 : x
  2. Step 2: Convert to fraction form
    933.23/1,287.91 = 513.67/x
  3. Step 3: Cross multiply
    933.23x = 1,287.91 × 513.67
  4. Step 4: Simplify right side
    933.23x = 661,559.12
  5. Step 5: Solve for x
    x = 661,559.12/933.23
  6. Step 6: Final answer
    x = 708.90

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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.