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Finding the Fourth Proportional to 603.07, 900.87 and 428.36

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Solution

The fourth proportional to 603.07, 900.87 and 428.36 is: 639.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    603.07 : 900.87 = 428.36 : x
  2. Step 2: Convert to fraction form
    603.07/900.87 = 428.36/x
  3. Step 3: Cross multiply
    603.07x = 900.87 × 428.36
  4. Step 4: Simplify right side
    603.07x = 385,900.57
  5. Step 5: Solve for x
    x = 385,900.57/603.07
  6. Step 6: Final answer
    x = 639.89

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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.