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Finding the Fourth Proportional to 2,187.37, 3,280.21 and 853.00

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Solution

The fourth proportional to 2,187.37, 3,280.21 and 853.00 is: 1,279.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,187.37 : 3,280.21 = 853.00 : x
  2. Step 2: Convert to fraction form
    2,187.37/3,280.21 = 853.00/x
  3. Step 3: Cross multiply
    2,187.37x = 3,280.21 × 853.00
  4. Step 4: Simplify right side
    2,187.37x = 2,798,008.80
  5. Step 5: Solve for x
    x = 2,798,008.80/2,187.37
  6. Step 6: Final answer
    x = 1,279.17

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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.