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Finding the Fourth Proportional to 665.37, 918.06 and 428.94

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Solution

The fourth proportional to 665.37, 918.06 and 428.94 is: 591.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    665.37 : 918.06 = 428.94 : x
  2. Step 2: Convert to fraction form
    665.37/918.06 = 428.94/x
  3. Step 3: Cross multiply
    665.37x = 918.06 × 428.94
  4. Step 4: Simplify right side
    665.37x = 393,792.66
  5. Step 5: Solve for x
    x = 393,792.66/665.37
  6. Step 6: Final answer
    x = 591.84

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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.