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Finding the Fourth Proportional to 427.36, 637.49 and 378.76

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Solution

The fourth proportional to 427.36, 637.49 and 378.76 is: 564.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    427.36 : 637.49 = 378.76 : x
  2. Step 2: Convert to fraction form
    427.36/637.49 = 378.76/x
  3. Step 3: Cross multiply
    427.36x = 637.49 × 378.76
  4. Step 4: Simplify right side
    427.36x = 241,455.71
  5. Step 5: Solve for x
    x = 241,455.71/427.36
  6. Step 6: Final answer
    x = 564.99

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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.