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Finding the Fourth Proportional to 434.40, 651.21 and 280.41

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Solution

The fourth proportional to 434.40, 651.21 and 280.41 is: 420.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    434.40 : 651.21 = 280.41 : x
  2. Step 2: Convert to fraction form
    434.40/651.21 = 280.41/x
  3. Step 3: Cross multiply
    434.40x = 651.21 × 280.41
  4. Step 4: Simplify right side
    434.40x = 182,605.80
  5. Step 5: Solve for x
    x = 182,605.80/434.40
  6. Step 6: Final answer
    x = 420.36

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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.