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Finding the Fourth Proportional to 660.75, 911.34 and 556.40

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Solution

The fourth proportional to 660.75, 911.34 and 556.40 is: 767.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    660.75 : 911.34 = 556.40 : x
  2. Step 2: Convert to fraction form
    660.75/911.34 = 556.40/x
  3. Step 3: Cross multiply
    660.75x = 911.34 × 556.40
  4. Step 4: Simplify right side
    660.75x = 507,065.02
  5. Step 5: Solve for x
    x = 507,065.02/660.75
  6. Step 6: Final answer
    x = 767.41

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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.