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Finding the Fourth Proportional to 661.90, 913.47 and 382.23

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Solution

The fourth proportional to 661.90, 913.47 and 382.23 is: 527.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    661.90 : 913.47 = 382.23 : x
  2. Step 2: Convert to fraction form
    661.90/913.47 = 382.23/x
  3. Step 3: Cross multiply
    661.90x = 913.47 × 382.23
  4. Step 4: Simplify right side
    661.90x = 349,155.64
  5. Step 5: Solve for x
    x = 349,155.64/661.90
  6. Step 6: Final answer
    x = 527.51

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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.