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Finding the Fourth Proportional to 622.96, 859.30 and 387.02

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Solution

The fourth proportional to 622.96, 859.30 and 387.02 is: 533.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    622.96 : 859.30 = 387.02 : x
  2. Step 2: Convert to fraction form
    622.96/859.30 = 387.02/x
  3. Step 3: Cross multiply
    622.96x = 859.30 × 387.02
  4. Step 4: Simplify right side
    622.96x = 332,566.29
  5. Step 5: Solve for x
    x = 332,566.29/622.96
  6. Step 6: Final answer
    x = 533.85

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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.