Home / 1,392.14-2,087.70-417.91

Finding the Fourth Proportional to 1,392.14, 2,087.70 and 417.91

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Solution

The fourth proportional to 1,392.14, 2,087.70 and 417.91 is: 626.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,392.14 : 2,087.70 = 417.91 : x
  2. Step 2: Convert to fraction form
    1,392.14/2,087.70 = 417.91/x
  3. Step 3: Cross multiply
    1,392.14x = 2,087.70 × 417.91
  4. Step 4: Simplify right side
    1,392.14x = 872,468.62
  5. Step 5: Solve for x
    x = 872,468.62/1,392.14
  6. Step 6: Final answer
    x = 626.71

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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.