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Finding the Fourth Proportional to 986.93, 1,480.40 and 256.51

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Solution

The fourth proportional to 986.93, 1,480.40 and 256.51 is: 384.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    986.93 : 1,480.40 = 256.51 : x
  2. Step 2: Convert to fraction form
    986.93/1,480.40 = 256.51/x
  3. Step 3: Cross multiply
    986.93x = 1,480.40 × 256.51
  4. Step 4: Simplify right side
    986.93x = 379,737.40
  5. Step 5: Solve for x
    x = 379,737.40/986.93
  6. Step 6: Final answer
    x = 384.77

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Double scale
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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.