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Finding the Fourth Proportional to 986.40, 1,361.74 and 655.38

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Solution

The fourth proportional to 986.40, 1,361.74 and 655.38 is: 904.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    986.40 : 1,361.74 = 655.38 : x
  2. Step 2: Convert to fraction form
    986.40/1,361.74 = 655.38/x
  3. Step 3: Cross multiply
    986.40x = 1,361.74 × 655.38
  4. Step 4: Simplify right side
    986.40x = 892,457.16
  5. Step 5: Solve for x
    x = 892,457.16/986.40
  6. Step 6: Final answer
    x = 904.76

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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.