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Finding the Fourth Proportional to 1,215.54, 1,808.72 and 1,211.44

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Solution

The fourth proportional to 1,215.54, 1,808.72 and 1,211.44 is: 1,802.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,215.54 : 1,808.72 = 1,211.44 : x
  2. Step 2: Convert to fraction form
    1,215.54/1,808.72 = 1,211.44/x
  3. Step 3: Cross multiply
    1,215.54x = 1,808.72 × 1,211.44
  4. Step 4: Simplify right side
    1,215.54x = 2,191,155.76
  5. Step 5: Solve for x
    x = 2,191,155.76/1,215.54
  6. Step 6: Final answer
    x = 1,802.62

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.