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Finding the Fourth Proportional to 665.55, 918.40 and 370.79

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Solution

The fourth proportional to 665.55, 918.40 and 370.79 is: 511.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    665.55 : 918.40 = 370.79 : x
  2. Step 2: Convert to fraction form
    665.55/918.40 = 370.79/x
  3. Step 3: Cross multiply
    665.55x = 918.40 × 370.79
  4. Step 4: Simplify right side
    665.55x = 340,533.54
  5. Step 5: Solve for x
    x = 340,533.54/665.55
  6. Step 6: Final answer
    x = 511.66

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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.