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Finding the Fourth Proportional to 715.58, 987 and 449.77

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Solution

The fourth proportional to 715.58, 987 and 449.77 is: 620.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    715.58 : 987 = 449.77 : x
  2. Step 2: Convert to fraction form
    715.58/987 = 449.77/x
  3. Step 3: Cross multiply
    715.58x = 987 × 449.77
  4. Step 4: Simplify right side
    715.58x = 443,922.99
  5. Step 5: Solve for x
    x = 443,922.99/715.58
  6. Step 6: Final answer
    x = 620.37

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.