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Finding the Fourth Proportional to 656.28, 977.40 and 638.94

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Solution

The fourth proportional to 656.28, 977.40 and 638.94 is: 951.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    656.28 : 977.40 = 638.94 : x
  2. Step 2: Convert to fraction form
    656.28/977.40 = 638.94/x
  3. Step 3: Cross multiply
    656.28x = 977.40 × 638.94
  4. Step 4: Simplify right side
    656.28x = 624,499.96
  5. Step 5: Solve for x
    x = 624,499.96/656.28
  6. Step 6: Final answer
    x = 951.58

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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.