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Finding the Fourth Proportional to 661.28, 911.56 and 521.14

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Solution

The fourth proportional to 661.28, 911.56 and 521.14 is: 718.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    661.28 : 911.56 = 521.14 : x
  2. Step 2: Convert to fraction form
    661.28/911.56 = 521.14/x
  3. Step 3: Cross multiply
    661.28x = 911.56 × 521.14
  4. Step 4: Simplify right side
    661.28x = 475,050.38
  5. Step 5: Solve for x
    x = 475,050.38/661.28
  6. Step 6: Final answer
    x = 718.38

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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.