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Finding the Fourth Proportional to 487.39, 730.68 and 198.63

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Solution

The fourth proportional to 487.39, 730.68 and 198.63 is: 297.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    487.39 : 730.68 = 198.63 : x
  2. Step 2: Convert to fraction form
    487.39/730.68 = 198.63/x
  3. Step 3: Cross multiply
    487.39x = 730.68 × 198.63
  4. Step 4: Simplify right side
    487.39x = 145,131.32
  5. Step 5: Solve for x
    x = 145,131.32/487.39
  6. Step 6: Final answer
    x = 297.77

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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.