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Finding the Fourth Proportional to 985.84, 1,361.62 and 653.69

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Solution

The fourth proportional to 985.84, 1,361.62 and 653.69 is: 902.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    985.84 : 1,361.62 = 653.69 : x
  2. Step 2: Convert to fraction form
    985.84/1,361.62 = 653.69/x
  3. Step 3: Cross multiply
    985.84x = 1,361.62 × 653.69
  4. Step 4: Simplify right side
    985.84x = 890,077.38
  5. Step 5: Solve for x
    x = 890,077.38/985.84
  6. Step 6: Final answer
    x = 902.86

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.