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Finding the Fourth Proportional to 407.84, 612.12 and 225.62

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Solution

The fourth proportional to 407.84, 612.12 and 225.62 is: 338.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    407.84 : 612.12 = 225.62 : x
  2. Step 2: Convert to fraction form
    407.84/612.12 = 225.62/x
  3. Step 3: Cross multiply
    407.84x = 612.12 × 225.62
  4. Step 4: Simplify right side
    407.84x = 138,106.51
  5. Step 5: Solve for x
    x = 138,106.51/407.84
  6. Step 6: Final answer
    x = 338.63

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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.