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Finding the Fourth Proportional to 622.94, 859.87 and 387.07

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Solution

The fourth proportional to 622.94, 859.87 and 387.07 is: 534.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    622.94 : 859.87 = 387.07 : x
  2. Step 2: Convert to fraction form
    622.94/859.87 = 387.07/x
  3. Step 3: Cross multiply
    622.94x = 859.87 × 387.07
  4. Step 4: Simplify right side
    622.94x = 332,826.76
  5. Step 5: Solve for x
    x = 332,826.76/622.94
  6. Step 6: Final answer
    x = 534.29

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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.