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Finding the Fourth Proportional to 660.48, 911.75 and 511.17

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Solution

The fourth proportional to 660.48, 911.75 and 511.17 is: 705.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    660.48 : 911.75 = 511.17 : x
  2. Step 2: Convert to fraction form
    660.48/911.75 = 511.17/x
  3. Step 3: Cross multiply
    660.48x = 911.75 × 511.17
  4. Step 4: Simplify right side
    660.48x = 466,059.25
  5. Step 5: Solve for x
    x = 466,059.25/660.48
  6. Step 6: Final answer
    x = 705.64

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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.