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Finding the Fourth Proportional to 655.67, 977.96 and 617.60

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Solution

The fourth proportional to 655.67, 977.96 and 617.60 is: 921.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    655.67 : 977.96 = 617.60 : x
  2. Step 2: Convert to fraction form
    655.67/977.96 = 617.60/x
  3. Step 3: Cross multiply
    655.67x = 977.96 × 617.60
  4. Step 4: Simplify right side
    655.67x = 603,982.43
  5. Step 5: Solve for x
    x = 603,982.43/655.67
  6. Step 6: Final answer
    x = 921.18

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.