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Finding the Fourth Proportional to 661.44, 913.26 and 440.91

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Solution

The fourth proportional to 661.44, 913.26 and 440.91 is: 608.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    661.44 : 913.26 = 440.91 : x
  2. Step 2: Convert to fraction form
    661.44/913.26 = 440.91/x
  3. Step 3: Cross multiply
    661.44x = 913.26 × 440.91
  4. Step 4: Simplify right side
    661.44x = 402,665.47
  5. Step 5: Solve for x
    x = 402,665.47/661.44
  6. Step 6: Final answer
    x = 608.77

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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.