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Finding the Fourth Proportional to 613.02, 918.76 and 287.67

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Solution

The fourth proportional to 613.02, 918.76 and 287.67 is: 431.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    613.02 : 918.76 = 287.67 : x
  2. Step 2: Convert to fraction form
    613.02/918.76 = 287.67/x
  3. Step 3: Cross multiply
    613.02x = 918.76 × 287.67
  4. Step 4: Simplify right side
    613.02x = 264,299.69
  5. Step 5: Solve for x
    x = 264,299.69/613.02
  6. Step 6: Final answer
    x = 431.14

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.