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Finding the Fourth Proportional to 903.32, 1,355.06 and 318.26

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Solution

The fourth proportional to 903.32, 1,355.06 and 318.26 is: 477.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    903.32 : 1,355.06 = 318.26 : x
  2. Step 2: Convert to fraction form
    903.32/1,355.06 = 318.26/x
  3. Step 3: Cross multiply
    903.32x = 1,355.06 × 318.26
  4. Step 4: Simplify right side
    903.32x = 431,265.58
  5. Step 5: Solve for x
    x = 431,265.58/903.32
  6. Step 6: Final answer
    x = 477.42

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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.