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Finding the Fourth Proportional to 446.87, 670.36 and 138.74

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Solution

The fourth proportional to 446.87, 670.36 and 138.74 is: 208.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    446.87 : 670.36 = 138.74 : x
  2. Step 2: Convert to fraction form
    446.87/670.36 = 138.74/x
  3. Step 3: Cross multiply
    446.87x = 670.36 × 138.74
  4. Step 4: Simplify right side
    446.87x = 93,005.75
  5. Step 5: Solve for x
    x = 93,005.75/446.87
  6. Step 6: Final answer
    x = 208.13

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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.