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Finding the Fourth Proportional to 622.44, 858.48 and 491.22

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Solution

The fourth proportional to 622.44, 858.48 and 491.22 is: 677.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    622.44 : 858.48 = 491.22 : x
  2. Step 2: Convert to fraction form
    622.44/858.48 = 491.22/x
  3. Step 3: Cross multiply
    622.44x = 858.48 × 491.22
  4. Step 4: Simplify right side
    622.44x = 421,702.55
  5. Step 5: Solve for x
    x = 421,702.55/622.44
  6. Step 6: Final answer
    x = 677.50

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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.