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Finding the Fourth Proportional to 930.49, 1,278.72 and 887.69

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Solution

The fourth proportional to 930.49, 1,278.72 and 887.69 is: 1,219.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    930.49 : 1,278.72 = 887.69 : x
  2. Step 2: Convert to fraction form
    930.49/1,278.72 = 887.69/x
  3. Step 3: Cross multiply
    930.49x = 1,278.72 × 887.69
  4. Step 4: Simplify right side
    930.49x = 1,135,110.15
  5. Step 5: Solve for x
    x = 1,135,110.15/930.49
  6. Step 6: Final answer
    x = 1,219.91

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.