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Finding the Fourth Proportional to 877.12, 1,315.68 and 299.96

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Solution

The fourth proportional to 877.12, 1,315.68 and 299.96 is: 449.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    877.12 : 1,315.68 = 299.96 : x
  2. Step 2: Convert to fraction form
    877.12/1,315.68 = 299.96/x
  3. Step 3: Cross multiply
    877.12x = 1,315.68 × 299.96
  4. Step 4: Simplify right side
    877.12x = 394,651.37
  5. Step 5: Solve for x
    x = 394,651.37/877.12
  6. Step 6: Final answer
    x = 449.94

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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.