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Finding the Fourth Proportional to 986.47, 1,481.82 and 621.52

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Solution

The fourth proportional to 986.47, 1,481.82 and 621.52 is: 933.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    986.47 : 1,481.82 = 621.52 : x
  2. Step 2: Convert to fraction form
    986.47/1,481.82 = 621.52/x
  3. Step 3: Cross multiply
    986.47x = 1,481.82 × 621.52
  4. Step 4: Simplify right side
    986.47x = 920,980.77
  5. Step 5: Solve for x
    x = 920,980.77/986.47
  6. Step 6: Final answer
    x = 933.61

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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.