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Finding the Fourth Proportional to 986.92, 1,480.47 and 256.51

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Solution

The fourth proportional to 986.92, 1,480.47 and 256.51 is: 384.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    986.92 : 1,480.47 = 256.51 : x
  2. Step 2: Convert to fraction form
    986.92/1,480.47 = 256.51/x
  3. Step 3: Cross multiply
    986.92x = 1,480.47 × 256.51
  4. Step 4: Simplify right side
    986.92x = 379,755.36
  5. Step 5: Solve for x
    x = 379,755.36/986.92
  6. Step 6: Final answer
    x = 384.79

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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.