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Finding the Fourth Proportional to 771.83, 1,064.49 and 491.97

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Solution

The fourth proportional to 771.83, 1,064.49 and 491.97 is: 678.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    771.83 : 1,064.49 = 491.97 : x
  2. Step 2: Convert to fraction form
    771.83/1,064.49 = 491.97/x
  3. Step 3: Cross multiply
    771.83x = 1,064.49 × 491.97
  4. Step 4: Simplify right side
    771.83x = 523,697.15
  5. Step 5: Solve for x
    x = 523,697.15/771.83
  6. Step 6: Final answer
    x = 678.52

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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.