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Finding the Fourth Proportional to 345.50, 518.28 and 89

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Solution

The fourth proportional to 345.50, 518.28 and 89 is: 133.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    345.50 : 518.28 = 89 : x
  2. Step 2: Convert to fraction form
    345.50/518.28 = 89/x
  3. Step 3: Cross multiply
    345.50x = 518.28 × 89
  4. Step 4: Simplify right side
    345.50x = 46,126.92
  5. Step 5: Solve for x
    x = 46,126.92/345.50
  6. Step 6: Final answer
    x = 133.51

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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.