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Finding the Fourth Proportional to 1,170.79, 1,616.34 and 855.74

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Solution

The fourth proportional to 1,170.79, 1,616.34 and 855.74 is: 1,181.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,170.79 : 1,616.34 = 855.74 : x
  2. Step 2: Convert to fraction form
    1,170.79/1,616.34 = 855.74/x
  3. Step 3: Cross multiply
    1,170.79x = 1,616.34 × 855.74
  4. Step 4: Simplify right side
    1,170.79x = 1,383,166.79
  5. Step 5: Solve for x
    x = 1,383,166.79/1,170.79
  6. Step 6: Final answer
    x = 1,181.40

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.