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Finding the Fourth Proportional to 2,086.07, 3,129.08 and 853.50

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Solution

The fourth proportional to 2,086.07, 3,129.08 and 853.50 is: 1,280.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,086.07 : 3,129.08 = 853.50 : x
  2. Step 2: Convert to fraction form
    2,086.07/3,129.08 = 853.50/x
  3. Step 3: Cross multiply
    2,086.07x = 3,129.08 × 853.50
  4. Step 4: Simplify right side
    2,086.07x = 2,670,665.51
  5. Step 5: Solve for x
    x = 2,670,665.51/2,086.07
  6. Step 6: Final answer
    x = 1,280.24

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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.