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Finding the Fourth Proportional to 622.72, 859.71 and 402

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Solution

The fourth proportional to 622.72, 859.71 and 402 is: 554.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    622.72 : 859.71 = 402 : x
  2. Step 2: Convert to fraction form
    622.72/859.71 = 402/x
  3. Step 3: Cross multiply
    622.72x = 859.71 × 402
  4. Step 4: Simplify right side
    622.72x = 345,603.42
  5. Step 5: Solve for x
    x = 345,603.42/622.72
  6. Step 6: Final answer
    x = 554.99

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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.