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Finding the Fourth Proportional to 903.75, 1,355.64 and 390.75

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Solution

The fourth proportional to 903.75, 1,355.64 and 390.75 is: 586.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    903.75 : 1,355.64 = 390.75 : x
  2. Step 2: Convert to fraction form
    903.75/1,355.64 = 390.75/x
  3. Step 3: Cross multiply
    903.75x = 1,355.64 × 390.75
  4. Step 4: Simplify right side
    903.75x = 529,716.33
  5. Step 5: Solve for x
    x = 529,716.33/903.75
  6. Step 6: Final answer
    x = 586.13

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.