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Finding the Fourth Proportional to 988.26, 1,482.31 and 338.91

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Solution

The fourth proportional to 988.26, 1,482.31 and 338.91 is: 508.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    988.26 : 1,482.31 = 338.91 : x
  2. Step 2: Convert to fraction form
    988.26/1,482.31 = 338.91/x
  3. Step 3: Cross multiply
    988.26x = 1,482.31 × 338.91
  4. Step 4: Simplify right side
    988.26x = 502,369.68
  5. Step 5: Solve for x
    x = 502,369.68/988.26
  6. Step 6: Final answer
    x = 508.34

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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.