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Finding the Fourth Proportional to 771.84, 1,157.76 and 449.28

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Solution

The fourth proportional to 771.84, 1,157.76 and 449.28 is: 673.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    771.84 : 1,157.76 = 449.28 : x
  2. Step 2: Convert to fraction form
    771.84/1,157.76 = 449.28/x
  3. Step 3: Cross multiply
    771.84x = 1,157.76 × 449.28
  4. Step 4: Simplify right side
    771.84x = 520,158.41
  5. Step 5: Solve for x
    x = 520,158.41/771.84
  6. Step 6: Final answer
    x = 673.92

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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.