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Finding the Fourth Proportional to 987.26, 1,361.61 and 671.99

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Solution

The fourth proportional to 987.26, 1,361.61 and 671.99 is: 926.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    987.26 : 1,361.61 = 671.99 : x
  2. Step 2: Convert to fraction form
    987.26/1,361.61 = 671.99/x
  3. Step 3: Cross multiply
    987.26x = 1,361.61 × 671.99
  4. Step 4: Simplify right side
    987.26x = 914,981.50
  5. Step 5: Solve for x
    x = 914,981.50/987.26
  6. Step 6: Final answer
    x = 926.79

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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.