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Finding the Fourth Proportional to 228.40, 342.78 and 147.40

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Solution

The fourth proportional to 228.40, 342.78 and 147.40 is: 221.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    228.40 : 342.78 = 147.40 : x
  2. Step 2: Convert to fraction form
    228.40/342.78 = 147.40/x
  3. Step 3: Cross multiply
    228.40x = 342.78 × 147.40
  4. Step 4: Simplify right side
    228.40x = 50,525.77
  5. Step 5: Solve for x
    x = 50,525.77/228.40
  6. Step 6: Final answer
    x = 221.22

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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.