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Finding the Fourth Proportional to 1,277.76, 1,916.62 and 412.06

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Solution

The fourth proportional to 1,277.76, 1,916.62 and 412.06 is: 618.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,277.76 : 1,916.62 = 412.06 : x
  2. Step 2: Convert to fraction form
    1,277.76/1,916.62 = 412.06/x
  3. Step 3: Cross multiply
    1,277.76x = 1,916.62 × 412.06
  4. Step 4: Simplify right side
    1,277.76x = 789,762.44
  5. Step 5: Solve for x
    x = 789,762.44/1,277.76
  6. Step 6: Final answer
    x = 618.08

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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.