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Finding the Fourth Proportional to 1,013.28, 1,520.64 and 628.80

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Solution

The fourth proportional to 1,013.28, 1,520.64 and 628.80 is: 943.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,013.28 : 1,520.64 = 628.80 : x
  2. Step 2: Convert to fraction form
    1,013.28/1,520.64 = 628.80/x
  3. Step 3: Cross multiply
    1,013.28x = 1,520.64 × 628.80
  4. Step 4: Simplify right side
    1,013.28x = 956,178.43
  5. Step 5: Solve for x
    x = 956,178.43/1,013.28
  6. Step 6: Final answer
    x = 943.65

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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.