Home / 1,278.35-1,916.77-400.62

Finding the Fourth Proportional to 1,278.35, 1,916.77 and 400.62

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Solution

The fourth proportional to 1,278.35, 1,916.77 and 400.62 is: 600.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,278.35 : 1,916.77 = 400.62 : x
  2. Step 2: Convert to fraction form
    1,278.35/1,916.77 = 400.62/x
  3. Step 3: Cross multiply
    1,278.35x = 1,916.77 × 400.62
  4. Step 4: Simplify right side
    1,278.35x = 767,894.39
  5. Step 5: Solve for x
    x = 767,894.39/1,278.35
  6. Step 6: Final answer
    x = 600.69

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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.