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Finding the Fourth Proportional to 903.38, 1,355.55 and 390.42

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Solution

The fourth proportional to 903.38, 1,355.55 and 390.42 is: 585.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    903.38 : 1,355.55 = 390.42 : x
  2. Step 2: Convert to fraction form
    903.38/1,355.55 = 390.42/x
  3. Step 3: Cross multiply
    903.38x = 1,355.55 × 390.42
  4. Step 4: Simplify right side
    903.38x = 529,233.83
  5. Step 5: Solve for x
    x = 529,233.83/903.38
  6. Step 6: Final answer
    x = 585.84

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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.