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Finding the Fourth Proportional to 771.72, 1,064.83 and 491.46

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Solution

The fourth proportional to 771.72, 1,064.83 and 491.46 is: 678.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    771.72 : 1,064.83 = 491.46 : x
  2. Step 2: Convert to fraction form
    771.72/1,064.83 = 491.46/x
  3. Step 3: Cross multiply
    771.72x = 1,064.83 × 491.46
  4. Step 4: Simplify right side
    771.72x = 523,321.35
  5. Step 5: Solve for x
    x = 523,321.35/771.72
  6. Step 6: Final answer
    x = 678.12

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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.