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Finding the Fourth Proportional to 341.20, 511.80 and 148.78

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Solution

The fourth proportional to 341.20, 511.80 and 148.78 is: 223.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    341.20 : 511.80 = 148.78 : x
  2. Step 2: Convert to fraction form
    341.20/511.80 = 148.78/x
  3. Step 3: Cross multiply
    341.20x = 511.80 × 148.78
  4. Step 4: Simplify right side
    341.20x = 76,145.60
  5. Step 5: Solve for x
    x = 76,145.60/341.20
  6. Step 6: Final answer
    x = 223.17

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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.