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Finding the Fourth Proportional to 661.21, 912.49 and 366.47

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Solution

The fourth proportional to 661.21, 912.49 and 366.47 is: 505.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    661.21 : 912.49 = 366.47 : x
  2. Step 2: Convert to fraction form
    661.21/912.49 = 366.47/x
  3. Step 3: Cross multiply
    661.21x = 912.49 × 366.47
  4. Step 4: Simplify right side
    661.21x = 334,400.21
  5. Step 5: Solve for x
    x = 334,400.21/661.21
  6. Step 6: Final answer
    x = 505.74

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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.