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Finding the Fourth Proportional to 665.15, 917.27 and 443.72

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Solution

The fourth proportional to 665.15, 917.27 and 443.72 is: 611.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    665.15 : 917.27 = 443.72 : x
  2. Step 2: Convert to fraction form
    665.15/917.27 = 443.72/x
  3. Step 3: Cross multiply
    665.15x = 917.27 × 443.72
  4. Step 4: Simplify right side
    665.15x = 407,004.24
  5. Step 5: Solve for x
    x = 407,004.24/665.15
  6. Step 6: Final answer
    x = 611.90

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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.