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Finding the Fourth Proportional to 807.41, 1,208.95 and 421.85

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Solution

The fourth proportional to 807.41, 1,208.95 and 421.85 is: 631.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    807.41 : 1,208.95 = 421.85 : x
  2. Step 2: Convert to fraction form
    807.41/1,208.95 = 421.85/x
  3. Step 3: Cross multiply
    807.41x = 1,208.95 × 421.85
  4. Step 4: Simplify right side
    807.41x = 509,997.53
  5. Step 5: Solve for x
    x = 509,997.53/807.41
  6. Step 6: Final answer
    x = 631.64

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.