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Finding the Fourth Proportional to 771.58, 1,064.46 and 491.68

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Solution

The fourth proportional to 771.58, 1,064.46 and 491.68 is: 678.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    771.58 : 1,064.46 = 491.68 : x
  2. Step 2: Convert to fraction form
    771.58/1,064.46 = 491.68/x
  3. Step 3: Cross multiply
    771.58x = 1,064.46 × 491.68
  4. Step 4: Simplify right side
    771.58x = 523,373.69
  5. Step 5: Solve for x
    x = 523,373.69/771.58
  6. Step 6: Final answer
    x = 678.31

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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.