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Finding the Fourth Proportional to 660.51, 911.10 and 520.41

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Solution

The fourth proportional to 660.51, 911.10 and 520.41 is: 717.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    660.51 : 911.10 = 520.41 : x
  2. Step 2: Convert to fraction form
    660.51/911.10 = 520.41/x
  3. Step 3: Cross multiply
    660.51x = 911.10 × 520.41
  4. Step 4: Simplify right side
    660.51x = 474,145.55
  5. Step 5: Solve for x
    x = 474,145.55/660.51
  6. Step 6: Final answer
    x = 717.85

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.