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Finding the Fourth Proportional to 1,264.69, 1,894.17 and 678.67

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Solution

The fourth proportional to 1,264.69, 1,894.17 and 678.67 is: 1,016.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,264.69 : 1,894.17 = 678.67 : x
  2. Step 2: Convert to fraction form
    1,264.69/1,894.17 = 678.67/x
  3. Step 3: Cross multiply
    1,264.69x = 1,894.17 × 678.67
  4. Step 4: Simplify right side
    1,264.69x = 1,285,516.35
  5. Step 5: Solve for x
    x = 1,285,516.35/1,264.69
  6. Step 6: Final answer
    x = 1,016.47

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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.