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Finding the Fourth Proportional to 771.19, 1,064.75 and 491.60

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Solution

The fourth proportional to 771.19, 1,064.75 and 491.60 is: 678.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    771.19 : 1,064.75 = 491.60 : x
  2. Step 2: Convert to fraction form
    771.19/1,064.75 = 491.60/x
  3. Step 3: Cross multiply
    771.19x = 1,064.75 × 491.60
  4. Step 4: Simplify right side
    771.19x = 523,431.30
  5. Step 5: Solve for x
    x = 523,431.30/771.19
  6. Step 6: Final answer
    x = 678.73

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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.