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Finding the Fourth Proportional to 601.11, 900.80 and 428.12

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Solution

The fourth proportional to 601.11, 900.80 and 428.12 is: 641.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    601.11 : 900.80 = 428.12 : x
  2. Step 2: Convert to fraction form
    601.11/900.80 = 428.12/x
  3. Step 3: Cross multiply
    601.11x = 900.80 × 428.12
  4. Step 4: Simplify right side
    601.11x = 385,643.85
  5. Step 5: Solve for x
    x = 385,643.85/601.11
  6. Step 6: Final answer
    x = 641.55

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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.