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Finding the Fourth Proportional to 660.11, 910.98 and 380.38

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Solution

The fourth proportional to 660.11, 910.98 and 380.38 is: 524.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    660.11 : 910.98 = 380.38 : x
  2. Step 2: Convert to fraction form
    660.11/910.98 = 380.38/x
  3. Step 3: Cross multiply
    660.11x = 910.98 × 380.38
  4. Step 4: Simplify right side
    660.11x = 346,518.28
  5. Step 5: Solve for x
    x = 346,518.28/660.11
  6. Step 6: Final answer
    x = 524.94

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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.