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Finding the Fourth Proportional to 2,185.95, 3,279.65 and 705.40

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Solution

The fourth proportional to 2,185.95, 3,279.65 and 705.40 is: 1,058.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,185.95 : 3,279.65 = 705.40 : x
  2. Step 2: Convert to fraction form
    2,185.95/3,279.65 = 705.40/x
  3. Step 3: Cross multiply
    2,185.95x = 3,279.65 × 705.40
  4. Step 4: Simplify right side
    2,185.95x = 2,313,465.11
  5. Step 5: Solve for x
    x = 2,313,465.11/2,185.95
  6. Step 6: Final answer
    x = 1,058.33

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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.