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Finding the Fourth Proportional to 787, 1,179.36 and 299.56

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Solution

The fourth proportional to 787, 1,179.36 and 299.56 is: 448.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    787 : 1,179.36 = 299.56 : x
  2. Step 2: Convert to fraction form
    787/1,179.36 = 299.56/x
  3. Step 3: Cross multiply
    787x = 1,179.36 × 299.56
  4. Step 4: Simplify right side
    787x = 353,289.08
  5. Step 5: Solve for x
    x = 353,289.08/787
  6. Step 6: Final answer
    x = 448.91

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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.