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Finding the Fourth Proportional to 665.49, 918.31 and 370.74

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Solution

The fourth proportional to 665.49, 918.31 and 370.74 is: 511.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    665.49 : 918.31 = 370.74 : x
  2. Step 2: Convert to fraction form
    665.49/918.31 = 370.74/x
  3. Step 3: Cross multiply
    665.49x = 918.31 × 370.74
  4. Step 4: Simplify right side
    665.49x = 340,454.25
  5. Step 5: Solve for x
    x = 340,454.25/665.49
  6. Step 6: Final answer
    x = 511.58

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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.