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Finding the Fourth Proportional to 432.14, 644.36 and 416.34

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Solution

The fourth proportional to 432.14, 644.36 and 416.34 is: 620.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    432.14 : 644.36 = 416.34 : x
  2. Step 2: Convert to fraction form
    432.14/644.36 = 416.34/x
  3. Step 3: Cross multiply
    432.14x = 644.36 × 416.34
  4. Step 4: Simplify right side
    432.14x = 268,270.76
  5. Step 5: Solve for x
    x = 268,270.76/432.14
  6. Step 6: Final answer
    x = 620.80

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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.