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Finding the Fourth Proportional to 622.29, 855.99 and 503.55

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Solution

The fourth proportional to 622.29, 855.99 and 503.55 is: 692.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    622.29 : 855.99 = 503.55 : x
  2. Step 2: Convert to fraction form
    622.29/855.99 = 503.55/x
  3. Step 3: Cross multiply
    622.29x = 855.99 × 503.55
  4. Step 4: Simplify right side
    622.29x = 431,033.76
  5. Step 5: Solve for x
    x = 431,033.76/622.29
  6. Step 6: Final answer
    x = 692.66

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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.