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Finding the Fourth Proportional to 903.58, 1,354.95 and 318.47

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Solution

The fourth proportional to 903.58, 1,354.95 and 318.47 is: 477.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    903.58 : 1,354.95 = 318.47 : x
  2. Step 2: Convert to fraction form
    903.58/1,354.95 = 318.47/x
  3. Step 3: Cross multiply
    903.58x = 1,354.95 × 318.47
  4. Step 4: Simplify right side
    903.58x = 431,504.15
  5. Step 5: Solve for x
    x = 431,504.15/903.58
  6. Step 6: Final answer
    x = 477.55

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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.