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Finding the Fourth Proportional to 986.10, 1,479.54 and 620.82

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Solution

The fourth proportional to 986.10, 1,479.54 and 620.82 is: 931.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    986.10 : 1,479.54 = 620.82 : x
  2. Step 2: Convert to fraction form
    986.10/1,479.54 = 620.82/x
  3. Step 3: Cross multiply
    986.10x = 1,479.54 × 620.82
  4. Step 4: Simplify right side
    986.10x = 918,528.02
  5. Step 5: Solve for x
    x = 918,528.02/986.10
  6. Step 6: Final answer
    x = 931.48

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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.