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Finding the Fourth Proportional to 622.78, 859.36 and 342.98

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Solution

The fourth proportional to 622.78, 859.36 and 342.98 is: 473.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    622.78 : 859.36 = 342.98 : x
  2. Step 2: Convert to fraction form
    622.78/859.36 = 342.98/x
  3. Step 3: Cross multiply
    622.78x = 859.36 × 342.98
  4. Step 4: Simplify right side
    622.78x = 294,743.29
  5. Step 5: Solve for x
    x = 294,743.29/622.78
  6. Step 6: Final answer
    x = 473.27

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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.