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Finding the Fourth Proportional to 904.35, 1,355.72 and 418.35

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Solution

The fourth proportional to 904.35, 1,355.72 and 418.35 is: 627.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    904.35 : 1,355.72 = 418.35 : x
  2. Step 2: Convert to fraction form
    904.35/1,355.72 = 418.35/x
  3. Step 3: Cross multiply
    904.35x = 1,355.72 × 418.35
  4. Step 4: Simplify right side
    904.35x = 567,163.37
  5. Step 5: Solve for x
    x = 567,163.37/904.35
  6. Step 6: Final answer
    x = 627.15

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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.