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Finding the Fourth Proportional to 661.75, 911.06 and 556.15

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Solution

The fourth proportional to 661.75, 911.06 and 556.15 is: 765.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    661.75 : 911.06 = 556.15 : x
  2. Step 2: Convert to fraction form
    661.75/911.06 = 556.15/x
  3. Step 3: Cross multiply
    661.75x = 911.06 × 556.15
  4. Step 4: Simplify right side
    661.75x = 506,683.24
  5. Step 5: Solve for x
    x = 506,683.24/661.75
  6. Step 6: Final answer
    x = 765.67

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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.