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Finding the Fourth Proportional to 985.26, 1,476.99 and 638.72

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Solution

The fourth proportional to 985.26, 1,476.99 and 638.72 is: 957.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    985.26 : 1,476.99 = 638.72 : x
  2. Step 2: Convert to fraction form
    985.26/1,476.99 = 638.72/x
  3. Step 3: Cross multiply
    985.26x = 1,476.99 × 638.72
  4. Step 4: Simplify right side
    985.26x = 943,375.67
  5. Step 5: Solve for x
    x = 943,375.67/985.26
  6. Step 6: Final answer
    x = 957.49

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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.