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Finding the Fourth Proportional to 661.44, 912.81 and 440.22

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Solution

The fourth proportional to 661.44, 912.81 and 440.22 is: 607.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    661.44 : 912.81 = 440.22 : x
  2. Step 2: Convert to fraction form
    661.44/912.81 = 440.22/x
  3. Step 3: Cross multiply
    661.44x = 912.81 × 440.22
  4. Step 4: Simplify right side
    661.44x = 401,837.22
  5. Step 5: Solve for x
    x = 401,837.22/661.44
  6. Step 6: Final answer
    x = 607.52

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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.