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Finding the Fourth Proportional to 903.45, 1,355.37 and 287.22

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Solution

The fourth proportional to 903.45, 1,355.37 and 287.22 is: 430.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    903.45 : 1,355.37 = 287.22 : x
  2. Step 2: Convert to fraction form
    903.45/1,355.37 = 287.22/x
  3. Step 3: Cross multiply
    903.45x = 1,355.37 × 287.22
  4. Step 4: Simplify right side
    903.45x = 389,289.37
  5. Step 5: Solve for x
    x = 389,289.37/903.45
  6. Step 6: Final answer
    x = 430.89

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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.