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Finding the Fourth Proportional to 614.40, 847.90 and 378.40

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Solution

The fourth proportional to 614.40, 847.90 and 378.40 is: 522.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    614.40 : 847.90 = 378.40 : x
  2. Step 2: Convert to fraction form
    614.40/847.90 = 378.40/x
  3. Step 3: Cross multiply
    614.40x = 847.90 × 378.40
  4. Step 4: Simplify right side
    614.40x = 320,845.36
  5. Step 5: Solve for x
    x = 320,845.36/614.40
  6. Step 6: Final answer
    x = 522.21

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.