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Finding the Fourth Proportional to 855.57, 1,283.51 and 307.81

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Solution

The fourth proportional to 855.57, 1,283.51 and 307.81 is: 461.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    855.57 : 1,283.51 = 307.81 : x
  2. Step 2: Convert to fraction form
    855.57/1,283.51 = 307.81/x
  3. Step 3: Cross multiply
    855.57x = 1,283.51 × 307.81
  4. Step 4: Simplify right side
    855.57x = 395,077.21
  5. Step 5: Solve for x
    x = 395,077.21/855.57
  6. Step 6: Final answer
    x = 461.77

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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.