Home / 1,278.65-1,918.08-401.15

Finding the Fourth Proportional to 1,278.65, 1,918.08 and 401.15

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Solution

The fourth proportional to 1,278.65, 1,918.08 and 401.15 is: 601.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,278.65 : 1,918.08 = 401.15 : x
  2. Step 2: Convert to fraction form
    1,278.65/1,918.08 = 401.15/x
  3. Step 3: Cross multiply
    1,278.65x = 1,918.08 × 401.15
  4. Step 4: Simplify right side
    1,278.65x = 769,442.59
  5. Step 5: Solve for x
    x = 769,442.59/1,278.65
  6. Step 6: Final answer
    x = 601.76

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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.