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Finding the Fourth Proportional to 1,277.92, 1,916.94 and 400.48

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Solution

The fourth proportional to 1,277.92, 1,916.94 and 400.48 is: 600.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,277.92 : 1,916.94 = 400.48 : x
  2. Step 2: Convert to fraction form
    1,277.92/1,916.94 = 400.48/x
  3. Step 3: Cross multiply
    1,277.92x = 1,916.94 × 400.48
  4. Step 4: Simplify right side
    1,277.92x = 767,696.13
  5. Step 5: Solve for x
    x = 767,696.13/1,277.92
  6. Step 6: Final answer
    x = 600.74

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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.