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Finding the Fourth Proportional to 345.76, 518.28 and 153.40

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Solution

The fourth proportional to 345.76, 518.28 and 153.40 is: 229.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    345.76 : 518.28 = 153.40 : x
  2. Step 2: Convert to fraction form
    345.76/518.28 = 153.40/x
  3. Step 3: Cross multiply
    345.76x = 518.28 × 153.40
  4. Step 4: Simplify right side
    345.76x = 79,504.15
  5. Step 5: Solve for x
    x = 79,504.15/345.76
  6. Step 6: Final answer
    x = 229.94

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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.