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Finding the Fourth Proportional to 753.35, 1,128.44 and 428.00

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Solution

The fourth proportional to 753.35, 1,128.44 and 428.00 is: 641.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    753.35 : 1,128.44 = 428.00 : x
  2. Step 2: Convert to fraction form
    753.35/1,128.44 = 428.00/x
  3. Step 3: Cross multiply
    753.35x = 1,128.44 × 428.00
  4. Step 4: Simplify right side
    753.35x = 482,967.75
  5. Step 5: Solve for x
    x = 482,967.75/753.35
  6. Step 6: Final answer
    x = 641.10

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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.