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Finding the Fourth Proportional to 986.99, 1,480.56 and 256.58

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Solution

The fourth proportional to 986.99, 1,480.56 and 256.58 is: 384.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    986.99 : 1,480.56 = 256.58 : x
  2. Step 2: Convert to fraction form
    986.99/1,480.56 = 256.58/x
  3. Step 3: Cross multiply
    986.99x = 1,480.56 × 256.58
  4. Step 4: Simplify right side
    986.99x = 379,874.68
  5. Step 5: Solve for x
    x = 379,874.68/986.99
  6. Step 6: Final answer
    x = 384.88

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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.