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Finding the Fourth Proportional to 903.95, 1,356.04 and 287.43

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Solution

The fourth proportional to 903.95, 1,356.04 and 287.43 is: 431.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    903.95 : 1,356.04 = 287.43 : x
  2. Step 2: Convert to fraction form
    903.95/1,356.04 = 287.43/x
  3. Step 3: Cross multiply
    903.95x = 1,356.04 × 287.43
  4. Step 4: Simplify right side
    903.95x = 389,766.58
  5. Step 5: Solve for x
    x = 389,766.58/903.95
  6. Step 6: Final answer
    x = 431.18

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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.