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Finding the Fourth Proportional to 854.90, 1,282.26 and 238.70

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Solution

The fourth proportional to 854.90, 1,282.26 and 238.70 is: 358.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    854.90 : 1,282.26 = 238.70 : x
  2. Step 2: Convert to fraction form
    854.90/1,282.26 = 238.70/x
  3. Step 3: Cross multiply
    854.90x = 1,282.26 × 238.70
  4. Step 4: Simplify right side
    854.90x = 306,075.46
  5. Step 5: Solve for x
    x = 306,075.46/854.90
  6. Step 6: Final answer
    x = 358.02

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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.