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Finding the Fourth Proportional to 419.12, 578.42 and 242.07

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Solution

The fourth proportional to 419.12, 578.42 and 242.07 is: 334.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    419.12 : 578.42 = 242.07 : x
  2. Step 2: Convert to fraction form
    419.12/578.42 = 242.07/x
  3. Step 3: Cross multiply
    419.12x = 578.42 × 242.07
  4. Step 4: Simplify right side
    419.12x = 140,018.73
  5. Step 5: Solve for x
    x = 140,018.73/419.12
  6. Step 6: Final answer
    x = 334.08

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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.