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Finding the Fourth Proportional to 983.21, 1,474.81 and 435.38

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Solution

The fourth proportional to 983.21, 1,474.81 and 435.38 is: 653.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    983.21 : 1,474.81 = 435.38 : x
  2. Step 2: Convert to fraction form
    983.21/1,474.81 = 435.38/x
  3. Step 3: Cross multiply
    983.21x = 1,474.81 × 435.38
  4. Step 4: Simplify right side
    983.21x = 642,094.32
  5. Step 5: Solve for x
    x = 642,094.32/983.21
  6. Step 6: Final answer
    x = 653.06

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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.