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Finding the Fourth Proportional to 771.74, 1,156.53 and 359.90

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Solution

The fourth proportional to 771.74, 1,156.53 and 359.90 is: 539.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    771.74 : 1,156.53 = 359.90 : x
  2. Step 2: Convert to fraction form
    771.74/1,156.53 = 359.90/x
  3. Step 3: Cross multiply
    771.74x = 1,156.53 × 359.90
  4. Step 4: Simplify right side
    771.74x = 416,235.15
  5. Step 5: Solve for x
    x = 416,235.15/771.74
  6. Step 6: Final answer
    x = 539.35

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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.