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Finding the Fourth Proportional to 145, 217.45 and 79.98

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Solution

The fourth proportional to 145, 217.45 and 79.98 is: 119.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    145 : 217.45 = 79.98 : x
  2. Step 2: Convert to fraction form
    145/217.45 = 79.98/x
  3. Step 3: Cross multiply
    145x = 217.45 × 79.98
  4. Step 4: Simplify right side
    145x = 17,391.65
  5. Step 5: Solve for x
    x = 17,391.65/145
  6. Step 6: Final answer
    x = 119.94

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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.