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Finding the Fourth Proportional to 228.60, 317.52 and 221.76

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Solution

The fourth proportional to 228.60, 317.52 and 221.76 is: 308.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    228.60 : 317.52 = 221.76 : x
  2. Step 2: Convert to fraction form
    228.60/317.52 = 221.76/x
  3. Step 3: Cross multiply
    228.60x = 317.52 × 221.76
  4. Step 4: Simplify right side
    228.60x = 70,413.24
  5. Step 5: Solve for x
    x = 70,413.24/228.60
  6. Step 6: Final answer
    x = 308.02

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These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.