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Finding the Fourth Proportional to 622.86, 859.59 and 389.58

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Solution

The fourth proportional to 622.86, 859.59 and 389.58 is: 537.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    622.86 : 859.59 = 389.58 : x
  2. Step 2: Convert to fraction form
    622.86/859.59 = 389.58/x
  3. Step 3: Cross multiply
    622.86x = 859.59 × 389.58
  4. Step 4: Simplify right side
    622.86x = 334,879.07
  5. Step 5: Solve for x
    x = 334,879.07/622.86
  6. Step 6: Final answer
    x = 537.65

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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.