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Finding the Fourth Proportional to 258.36, 385.16 and 242.85

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Solution

The fourth proportional to 258.36, 385.16 and 242.85 is: 362.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    258.36 : 385.16 = 242.85 : x
  2. Step 2: Convert to fraction form
    258.36/385.16 = 242.85/x
  3. Step 3: Cross multiply
    258.36x = 385.16 × 242.85
  4. Step 4: Simplify right side
    258.36x = 93,536.11
  5. Step 5: Solve for x
    x = 93,536.11/258.36
  6. Step 6: Final answer
    x = 362.04

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.