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Finding the Fourth Proportional to 228.45, 342.60 and 91.50

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Solution

The fourth proportional to 228.45, 342.60 and 91.50 is: 137.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    228.45 : 342.60 = 91.50 : x
  2. Step 2: Convert to fraction form
    228.45/342.60 = 91.50/x
  3. Step 3: Cross multiply
    228.45x = 342.60 × 91.50
  4. Step 4: Simplify right side
    228.45x = 31,347.90
  5. Step 5: Solve for x
    x = 31,347.90/228.45
  6. Step 6: Final answer
    x = 137.22

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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.