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Finding the Fourth Proportional to 771.98, 1,158.64 and 407.02

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Solution

The fourth proportional to 771.98, 1,158.64 and 407.02 is: 610.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    771.98 : 1,158.64 = 407.02 : x
  2. Step 2: Convert to fraction form
    771.98/1,158.64 = 407.02/x
  3. Step 3: Cross multiply
    771.98x = 1,158.64 × 407.02
  4. Step 4: Simplify right side
    771.98x = 471,589.65
  5. Step 5: Solve for x
    x = 471,589.65/771.98
  6. Step 6: Final answer
    x = 610.88

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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.