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Finding the Fourth Proportional to 986.64, 1,479.94 and 256.19

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Solution

The fourth proportional to 986.64, 1,479.94 and 256.19 is: 384.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    986.64 : 1,479.94 = 256.19 : x
  2. Step 2: Convert to fraction form
    986.64/1,479.94 = 256.19/x
  3. Step 3: Cross multiply
    986.64x = 1,479.94 × 256.19
  4. Step 4: Simplify right side
    986.64x = 379,145.83
  5. Step 5: Solve for x
    x = 379,145.83/986.64
  6. Step 6: Final answer
    x = 384.28

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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.