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Finding the Fourth Proportional to 434.63, 651.38 and 378.80

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Solution

The fourth proportional to 434.63, 651.38 and 378.80 is: 567.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    434.63 : 651.38 = 378.80 : x
  2. Step 2: Convert to fraction form
    434.63/651.38 = 378.80/x
  3. Step 3: Cross multiply
    434.63x = 651.38 × 378.80
  4. Step 4: Simplify right side
    434.63x = 246,737.59
  5. Step 5: Solve for x
    x = 246,737.59/434.63
  6. Step 6: Final answer
    x = 567.70

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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.