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Finding the Fourth Proportional to 245.78, 368.74 and 218.90

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Solution

The fourth proportional to 245.78, 368.74 and 218.90 is: 328.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    245.78 : 368.74 = 218.90 : x
  2. Step 2: Convert to fraction form
    245.78/368.74 = 218.90/x
  3. Step 3: Cross multiply
    245.78x = 368.74 × 218.90
  4. Step 4: Simplify right side
    245.78x = 80,717.19
  5. Step 5: Solve for x
    x = 80,717.19/245.78
  6. Step 6: Final answer
    x = 328.41

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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.