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Finding the Fourth Proportional to 771.14, 1,064.64 and 476.80

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Solution

The fourth proportional to 771.14, 1,064.64 and 476.80 is: 658.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    771.14 : 1,064.64 = 476.80 : x
  2. Step 2: Convert to fraction form
    771.14/1,064.64 = 476.80/x
  3. Step 3: Cross multiply
    771.14x = 1,064.64 × 476.80
  4. Step 4: Simplify right side
    771.14x = 507,620.35
  5. Step 5: Solve for x
    x = 507,620.35/771.14
  6. Step 6: Final answer
    x = 658.27

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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.