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Finding the Fourth Proportional to 655.85, 977.79 and 639.02

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Solution

The fourth proportional to 655.85, 977.79 and 639.02 is: 952.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    655.85 : 977.79 = 639.02 : x
  2. Step 2: Convert to fraction form
    655.85/977.79 = 639.02/x
  3. Step 3: Cross multiply
    655.85x = 977.79 × 639.02
  4. Step 4: Simplify right side
    655.85x = 624,822.48
  5. Step 5: Solve for x
    x = 624,822.48/655.85
  6. Step 6: Final answer
    x = 952.70

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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.