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Finding the Fourth Proportional to 986.13, 1,478.29 and 336.42

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Solution

The fourth proportional to 986.13, 1,478.29 and 336.42 is: 504.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    986.13 : 1,478.29 = 336.42 : x
  2. Step 2: Convert to fraction form
    986.13/1,478.29 = 336.42/x
  3. Step 3: Cross multiply
    986.13x = 1,478.29 × 336.42
  4. Step 4: Simplify right side
    986.13x = 497,326.32
  5. Step 5: Solve for x
    x = 497,326.32/986.13
  6. Step 6: Final answer
    x = 504.32

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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.