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Finding the Fourth Proportional to 430.37, 644.73 and 285.38

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Solution

The fourth proportional to 430.37, 644.73 and 285.38 is: 427.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    430.37 : 644.73 = 285.38 : x
  2. Step 2: Convert to fraction form
    430.37/644.73 = 285.38/x
  3. Step 3: Cross multiply
    430.37x = 644.73 × 285.38
  4. Step 4: Simplify right side
    430.37x = 183,989.82
  5. Step 5: Solve for x
    x = 183,989.82/430.37
  6. Step 6: Final answer
    x = 427.52

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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.