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Finding the Fourth Proportional to 1,277.72, 1,916.70 and 628.04

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Solution

The fourth proportional to 1,277.72, 1,916.70 and 628.04 is: 942.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,277.72 : 1,916.70 = 628.04 : x
  2. Step 2: Convert to fraction form
    1,277.72/1,916.70 = 628.04/x
  3. Step 3: Cross multiply
    1,277.72x = 1,916.70 × 628.04
  4. Step 4: Simplify right side
    1,277.72x = 1,203,764.27
  5. Step 5: Solve for x
    x = 1,203,764.27/1,277.72
  6. Step 6: Final answer
    x = 942.12

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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.