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Finding the Fourth Proportional to 903.36, 1,354.98 and 318.38

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Solution

The fourth proportional to 903.36, 1,354.98 and 318.38 is: 477.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    903.36 : 1,354.98 = 318.38 : x
  2. Step 2: Convert to fraction form
    903.36/1,354.98 = 318.38/x
  3. Step 3: Cross multiply
    903.36x = 1,354.98 × 318.38
  4. Step 4: Simplify right side
    903.36x = 431,398.53
  5. Step 5: Solve for x
    x = 431,398.53/903.36
  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.