Home / 1,078.18-1,617.45-428.96

Finding the Fourth Proportional to 1,078.18, 1,617.45 and 428.96

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Solution

The fourth proportional to 1,078.18, 1,617.45 and 428.96 is: 643.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,078.18 : 1,617.45 = 428.96 : x
  2. Step 2: Convert to fraction form
    1,078.18/1,617.45 = 428.96/x
  3. Step 3: Cross multiply
    1,078.18x = 1,617.45 × 428.96
  4. Step 4: Simplify right side
    1,078.18x = 693,821.35
  5. Step 5: Solve for x
    x = 693,821.35/1,078.18
  6. Step 6: Final answer
    x = 643.51

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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.