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Finding the Fourth Proportional to 622.05, 858.43 and 389.13

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Solution

The fourth proportional to 622.05, 858.43 and 389.13 is: 537.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    622.05 : 858.43 = 389.13 : x
  2. Step 2: Convert to fraction form
    622.05/858.43 = 389.13/x
  3. Step 3: Cross multiply
    622.05x = 858.43 × 389.13
  4. Step 4: Simplify right side
    622.05x = 334,040.87
  5. Step 5: Solve for x
    x = 334,040.87/622.05
  6. Step 6: Final answer
    x = 537.00

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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.