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Finding the Fourth Proportional to 771.12, 1,156.68 and 338.28

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Solution

The fourth proportional to 771.12, 1,156.68 and 338.28 is: 507.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    771.12 : 1,156.68 = 338.28 : x
  2. Step 2: Convert to fraction form
    771.12/1,156.68 = 338.28/x
  3. Step 3: Cross multiply
    771.12x = 1,156.68 × 338.28
  4. Step 4: Simplify right side
    771.12x = 391,281.71
  5. Step 5: Solve for x
    x = 391,281.71/771.12
  6. Step 6: Final answer
    x = 507.42

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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.