Home / 1,290.46-1,935.99-424.78

Finding the Fourth Proportional to 1,290.46, 1,935.99 and 424.78

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Solution

The fourth proportional to 1,290.46, 1,935.99 and 424.78 is: 637.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,290.46 : 1,935.99 = 424.78 : x
  2. Step 2: Convert to fraction form
    1,290.46/1,935.99 = 424.78/x
  3. Step 3: Cross multiply
    1,290.46x = 1,935.99 × 424.78
  4. Step 4: Simplify right side
    1,290.46x = 822,369.83
  5. Step 5: Solve for x
    x = 822,369.83/1,290.46
  6. Step 6: Final answer
    x = 637.27

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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.