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Finding the Fourth Proportional to 986.98, 1,480.46 and 256.49

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Solution

The fourth proportional to 986.98, 1,480.46 and 256.49 is: 384.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    986.98 : 1,480.46 = 256.49 : x
  2. Step 2: Convert to fraction form
    986.98/1,480.46 = 256.49/x
  3. Step 3: Cross multiply
    986.98x = 1,480.46 × 256.49
  4. Step 4: Simplify right side
    986.98x = 379,723.19
  5. Step 5: Solve for x
    x = 379,723.19/986.98
  6. Step 6: Final answer
    x = 384.73

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Double scale
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1.5x scale

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.