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Finding the Fourth Proportional to 977.37, 1,466.21 and 429.54

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Solution

The fourth proportional to 977.37, 1,466.21 and 429.54 is: 644.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    977.37 : 1,466.21 = 429.54 : x
  2. Step 2: Convert to fraction form
    977.37/1,466.21 = 429.54/x
  3. Step 3: Cross multiply
    977.37x = 1,466.21 × 429.54
  4. Step 4: Simplify right side
    977.37x = 629,795.84
  5. Step 5: Solve for x
    x = 629,795.84/977.37
  6. Step 6: Final answer
    x = 644.38

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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.