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Finding the Fourth Proportional to 665.18, 917.72 and 444.06

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Solution

The fourth proportional to 665.18, 917.72 and 444.06 is: 612.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    665.18 : 917.72 = 444.06 : x
  2. Step 2: Convert to fraction form
    665.18/917.72 = 444.06/x
  3. Step 3: Cross multiply
    665.18x = 917.72 × 444.06
  4. Step 4: Simplify right side
    665.18x = 407,522.74
  5. Step 5: Solve for x
    x = 407,522.74/665.18
  6. Step 6: Final answer
    x = 612.65

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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.