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Finding the Fourth Proportional to 855.41, 1,282.23 and 307.31

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Solution

The fourth proportional to 855.41, 1,282.23 and 307.31 is: 460.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    855.41 : 1,282.23 = 307.31 : x
  2. Step 2: Convert to fraction form
    855.41/1,282.23 = 307.31/x
  3. Step 3: Cross multiply
    855.41x = 1,282.23 × 307.31
  4. Step 4: Simplify right side
    855.41x = 394,035.69
  5. Step 5: Solve for x
    x = 394,035.69/855.41
  6. Step 6: Final answer
    x = 460.64

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1.5x scale

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.