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Finding the Fourth Proportional to 675.60, 1,013.50 and 300.78

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Solution

The fourth proportional to 675.60, 1,013.50 and 300.78 is: 451.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    675.60 : 1,013.50 = 300.78 : x
  2. Step 2: Convert to fraction form
    675.60/1,013.50 = 300.78/x
  3. Step 3: Cross multiply
    675.60x = 1,013.50 × 300.78
  4. Step 4: Simplify right side
    675.60x = 304,833.96
  5. Step 5: Solve for x
    x = 304,833.96/675.60
  6. Step 6: Final answer
    x = 451.20

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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.