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Finding the Fourth Proportional to 665.18, 917 and 444.05

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Solution

The fourth proportional to 665.18, 917 and 444.05 is: 612.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    665.18 : 917 = 444.05 : x
  2. Step 2: Convert to fraction form
    665.18/917 = 444.05/x
  3. Step 3: Cross multiply
    665.18x = 917 × 444.05
  4. Step 4: Simplify right side
    665.18x = 407,193.85
  5. Step 5: Solve for x
    x = 407,193.85/665.18
  6. Step 6: Final answer
    x = 612.16

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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.