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Finding the Fourth Proportional to 655.60, 981.96 and 381.01

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Solution

The fourth proportional to 655.60, 981.96 and 381.01 is: 570.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    655.60 : 981.96 = 381.01 : x
  2. Step 2: Convert to fraction form
    655.60/981.96 = 381.01/x
  3. Step 3: Cross multiply
    655.60x = 981.96 × 381.01
  4. Step 4: Simplify right side
    655.60x = 374,136.58
  5. Step 5: Solve for x
    x = 374,136.58/655.60
  6. Step 6: Final answer
    x = 570.68

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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.