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Finding the Fourth Proportional to 1,201.74, 1,801.74 and 810.78

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Solution

The fourth proportional to 1,201.74, 1,801.74 and 810.78 is: 1,215.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,201.74 : 1,801.74 = 810.78 : x
  2. Step 2: Convert to fraction form
    1,201.74/1,801.74 = 810.78/x
  3. Step 3: Cross multiply
    1,201.74x = 1,801.74 × 810.78
  4. Step 4: Simplify right side
    1,201.74x = 1,460,814.76
  5. Step 5: Solve for x
    x = 1,460,814.76/1,201.74
  6. Step 6: Final answer
    x = 1,215.58

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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.