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Finding the Fourth Proportional to 213, 319.45 and 104.77

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Solution

The fourth proportional to 213, 319.45 and 104.77 is: 157.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    213 : 319.45 = 104.77 : x
  2. Step 2: Convert to fraction form
    213/319.45 = 104.77/x
  3. Step 3: Cross multiply
    213x = 319.45 × 104.77
  4. Step 4: Simplify right side
    213x = 33,468.78
  5. Step 5: Solve for x
    x = 33,468.78/213
  6. Step 6: Final answer
    x = 157.13

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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.