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Finding the Fourth Proportional to 771.53, 1,064.41 and 491.71

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Solution

The fourth proportional to 771.53, 1,064.41 and 491.71 is: 678.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    771.53 : 1,064.41 = 491.71 : x
  2. Step 2: Convert to fraction form
    771.53/1,064.41 = 491.71/x
  3. Step 3: Cross multiply
    771.53x = 1,064.41 × 491.71
  4. Step 4: Simplify right side
    771.53x = 523,381.04
  5. Step 5: Solve for x
    x = 523,381.04/771.53
  6. Step 6: Final answer
    x = 678.37

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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.