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Finding the Fourth Proportional to 660.54, 911.54 and 380.67

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Solution

The fourth proportional to 660.54, 911.54 and 380.67 is: 525.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    660.54 : 911.54 = 380.67 : x
  2. Step 2: Convert to fraction form
    660.54/911.54 = 380.67/x
  3. Step 3: Cross multiply
    660.54x = 911.54 × 380.67
  4. Step 4: Simplify right side
    660.54x = 346,994.03
  5. Step 5: Solve for x
    x = 346,994.03/660.54
  6. Step 6: Final answer
    x = 525.32

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Half scale
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Double scale
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1.5x scale

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.