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Finding the Fourth Proportional to 665.30, 918.20 and 370.67

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Solution

The fourth proportional to 665.30, 918.20 and 370.67 is: 511.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    665.30 : 918.20 = 370.67 : x
  2. Step 2: Convert to fraction form
    665.30/918.20 = 370.67/x
  3. Step 3: Cross multiply
    665.30x = 918.20 × 370.67
  4. Step 4: Simplify right side
    665.30x = 340,345.53
  5. Step 5: Solve for x
    x = 340,345.53/665.30
  6. Step 6: Final answer
    x = 511.57

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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.