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Finding the Fourth Proportional to 661, 911.56 and 475.41

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Solution

The fourth proportional to 661, 911.56 and 475.41 is: 655.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    661 : 911.56 = 475.41 : x
  2. Step 2: Convert to fraction form
    661/911.56 = 475.41/x
  3. Step 3: Cross multiply
    661x = 911.56 × 475.41
  4. Step 4: Simplify right side
    661x = 433,364.74
  5. Step 5: Solve for x
    x = 433,364.74/661
  6. Step 6: Final answer
    x = 655.62

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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.