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Finding the Fourth Proportional to 407.84, 561.74 and 309.44

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Solution

The fourth proportional to 407.84, 561.74 and 309.44 is: 426.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    407.84 : 561.74 = 309.44 : x
  2. Step 2: Convert to fraction form
    407.84/561.74 = 309.44/x
  3. Step 3: Cross multiply
    407.84x = 561.74 × 309.44
  4. Step 4: Simplify right side
    407.84x = 173,824.83
  5. Step 5: Solve for x
    x = 173,824.83/407.84
  6. Step 6: Final answer
    x = 426.21

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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.