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Finding the Fourth Proportional to 983.26, 1,474.94 and 435.45

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Solution

The fourth proportional to 983.26, 1,474.94 and 435.45 is: 653.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    983.26 : 1,474.94 = 435.45 : x
  2. Step 2: Convert to fraction form
    983.26/1,474.94 = 435.45/x
  3. Step 3: Cross multiply
    983.26x = 1,474.94 × 435.45
  4. Step 4: Simplify right side
    983.26x = 642,262.62
  5. Step 5: Solve for x
    x = 642,262.62/983.26
  6. Step 6: Final answer
    x = 653.20

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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.