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Finding the Fourth Proportional to 855.09, 1,281.99 and 307.11

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Solution

The fourth proportional to 855.09, 1,281.99 and 307.11 is: 460.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    855.09 : 1,281.99 = 307.11 : x
  2. Step 2: Convert to fraction form
    855.09/1,281.99 = 307.11/x
  3. Step 3: Cross multiply
    855.09x = 1,281.99 × 307.11
  4. Step 4: Simplify right side
    855.09x = 393,711.95
  5. Step 5: Solve for x
    x = 393,711.95/855.09
  6. Step 6: Final answer
    x = 460.43

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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.