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Finding the Fourth Proportional to 661.16, 911.74 and 440.12

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Solution

The fourth proportional to 661.16, 911.74 and 440.12 is: 606.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    661.16 : 911.74 = 440.12 : x
  2. Step 2: Convert to fraction form
    661.16/911.74 = 440.12/x
  3. Step 3: Cross multiply
    661.16x = 911.74 × 440.12
  4. Step 4: Simplify right side
    661.16x = 401,275.01
  5. Step 5: Solve for x
    x = 401,275.01/661.16
  6. Step 6: Final answer
    x = 606.93

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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.