Home / 1,078.23-1,618.11-429.12

Finding the Fourth Proportional to 1,078.23, 1,618.11 and 429.12

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Solution

The fourth proportional to 1,078.23, 1,618.11 and 429.12 is: 643.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,078.23 : 1,618.11 = 429.12 : x
  2. Step 2: Convert to fraction form
    1,078.23/1,618.11 = 429.12/x
  3. Step 3: Cross multiply
    1,078.23x = 1,618.11 × 429.12
  4. Step 4: Simplify right side
    1,078.23x = 694,363.36
  5. Step 5: Solve for x
    x = 694,363.36/1,078.23
  6. Step 6: Final answer
    x = 643.98

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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.