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Finding the Fourth Proportional to 986.44, 1,479.30 and 431.08

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Solution

The fourth proportional to 986.44, 1,479.30 and 431.08 is: 646.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    986.44 : 1,479.30 = 431.08 : x
  2. Step 2: Convert to fraction form
    986.44/1,479.30 = 431.08/x
  3. Step 3: Cross multiply
    986.44x = 1,479.30 × 431.08
  4. Step 4: Simplify right side
    986.44x = 637,696.64
  5. Step 5: Solve for x
    x = 637,696.64/986.44
  6. Step 6: Final answer
    x = 646.46

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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.