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Finding the Fourth Proportional to 1,224.05, 1,836.08 and 860.47

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Solution

The fourth proportional to 1,224.05, 1,836.08 and 860.47 is: 1,290.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,224.05 : 1,836.08 = 860.47 : x
  2. Step 2: Convert to fraction form
    1,224.05/1,836.08 = 860.47/x
  3. Step 3: Cross multiply
    1,224.05x = 1,836.08 × 860.47
  4. Step 4: Simplify right side
    1,224.05x = 1,579,889.32
  5. Step 5: Solve for x
    x = 1,579,889.32/1,224.05
  6. Step 6: Final answer
    x = 1,290.70

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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.