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Finding the Fourth Proportional to 622.78, 859.07 and 386.77

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Solution

The fourth proportional to 622.78, 859.07 and 386.77 is: 533.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    622.78 : 859.07 = 386.77 : x
  2. Step 2: Convert to fraction form
    622.78/859.07 = 386.77/x
  3. Step 3: Cross multiply
    622.78x = 859.07 × 386.77
  4. Step 4: Simplify right side
    622.78x = 332,261.32
  5. Step 5: Solve for x
    x = 332,261.32/622.78
  6. Step 6: Final answer
    x = 533.52

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Double scale
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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.