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Finding the Fourth Proportional to 486.87, 730.40 and 198.51

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Solution

The fourth proportional to 486.87, 730.40 and 198.51 is: 297.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    486.87 : 730.40 = 198.51 : x
  2. Step 2: Convert to fraction form
    486.87/730.40 = 198.51/x
  3. Step 3: Cross multiply
    486.87x = 730.40 × 198.51
  4. Step 4: Simplify right side
    486.87x = 144,990.71
  5. Step 5: Solve for x
    x = 144,990.71/486.87
  6. Step 6: Final answer
    x = 297.80

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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.