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Finding the Fourth Proportional to 429.99, 644.85 and 156.03

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Solution

The fourth proportional to 429.99, 644.85 and 156.03 is: 234.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    429.99 : 644.85 = 156.03 : x
  2. Step 2: Convert to fraction form
    429.99/644.85 = 156.03/x
  3. Step 3: Cross multiply
    429.99x = 644.85 × 156.03
  4. Step 4: Simplify right side
    429.99x = 100,615.95
  5. Step 5: Solve for x
    x = 100,615.95/429.99
  6. Step 6: Final answer
    x = 234.00

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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.