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Finding the Fourth Proportional to 1,211.88, 1,814.10 and 978.60

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Solution

The fourth proportional to 1,211.88, 1,814.10 and 978.60 is: 1,464.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,211.88 : 1,814.10 = 978.60 : x
  2. Step 2: Convert to fraction form
    1,211.88/1,814.10 = 978.60/x
  3. Step 3: Cross multiply
    1,211.88x = 1,814.10 × 978.60
  4. Step 4: Simplify right side
    1,211.88x = 1,775,278.26
  5. Step 5: Solve for x
    x = 1,775,278.26/1,211.88
  6. Step 6: Final answer
    x = 1,464.90

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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.