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Finding the Fourth Proportional to 603, 903.47 and 428.81

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Solution

The fourth proportional to 603, 903.47 and 428.81 is: 642.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    603 : 903.47 = 428.81 : x
  2. Step 2: Convert to fraction form
    603/903.47 = 428.81/x
  3. Step 3: Cross multiply
    603x = 903.47 × 428.81
  4. Step 4: Simplify right side
    603x = 387,410.31
  5. Step 5: Solve for x
    x = 387,410.31/603
  6. Step 6: Final answer
    x = 642.47

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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.