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Finding the Fourth Proportional to 427.30, 637.61 and 381.33

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Solution

The fourth proportional to 427.30, 637.61 and 381.33 is: 569.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    427.30 : 637.61 = 381.33 : x
  2. Step 2: Convert to fraction form
    427.30/637.61 = 381.33/x
  3. Step 3: Cross multiply
    427.30x = 637.61 × 381.33
  4. Step 4: Simplify right side
    427.30x = 243,139.82
  5. Step 5: Solve for x
    x = 243,139.82/427.30
  6. Step 6: Final answer
    x = 569.01

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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.