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Finding the Fourth Proportional to 665, 917.46 and 385.16

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Solution

The fourth proportional to 665, 917.46 and 385.16 is: 531.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    665 : 917.46 = 385.16 : x
  2. Step 2: Convert to fraction form
    665/917.46 = 385.16/x
  3. Step 3: Cross multiply
    665x = 917.46 × 385.16
  4. Step 4: Simplify right side
    665x = 353,368.89
  5. Step 5: Solve for x
    x = 353,368.89/665
  6. Step 6: Final answer
    x = 531.38

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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.