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Finding the Fourth Proportional to 1,013.80, 1,520.60 and 355.61

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Solution

The fourth proportional to 1,013.80, 1,520.60 and 355.61 is: 533.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,013.80 : 1,520.60 = 355.61 : x
  2. Step 2: Convert to fraction form
    1,013.80/1,520.60 = 355.61/x
  3. Step 3: Cross multiply
    1,013.80x = 1,520.60 × 355.61
  4. Step 4: Simplify right side
    1,013.80x = 540,740.57
  5. Step 5: Solve for x
    x = 540,740.57/1,013.80
  6. Step 6: Final answer
    x = 533.38

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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.