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Finding the Fourth Proportional to 282.90, 390.34 and 178

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Solution

The fourth proportional to 282.90, 390.34 and 178 is: 245.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    282.90 : 390.34 = 178 : x
  2. Step 2: Convert to fraction form
    282.90/390.34 = 178/x
  3. Step 3: Cross multiply
    282.90x = 390.34 × 178
  4. Step 4: Simplify right side
    282.90x = 69,480.52
  5. Step 5: Solve for x
    x = 69,480.52/282.90
  6. Step 6: Final answer
    x = 245.60

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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.