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Finding the Fourth Proportional to 1,108.95, 1,661.87 and 847.94

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Solution

The fourth proportional to 1,108.95, 1,661.87 and 847.94 is: 1,270.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,108.95 : 1,661.87 = 847.94 : x
  2. Step 2: Convert to fraction form
    1,108.95/1,661.87 = 847.94/x
  3. Step 3: Cross multiply
    1,108.95x = 1,661.87 × 847.94
  4. Step 4: Simplify right side
    1,108.95x = 1,409,153.50
  5. Step 5: Solve for x
    x = 1,409,153.50/1,108.95
  6. Step 6: Final answer
    x = 1,270.71

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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.