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Finding the Fourth Proportional to 986.72, 1,361.53 and 655.64

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Solution

The fourth proportional to 986.72, 1,361.53 and 655.64 is: 904.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    986.72 : 1,361.53 = 655.64 : x
  2. Step 2: Convert to fraction form
    986.72/1,361.53 = 655.64/x
  3. Step 3: Cross multiply
    986.72x = 1,361.53 × 655.64
  4. Step 4: Simplify right side
    986.72x = 892,665.08
  5. Step 5: Solve for x
    x = 892,665.08/986.72
  6. Step 6: Final answer
    x = 904.68

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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.