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Finding the Fourth Proportional to 771.06, 1,064.68 and 491.78

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Solution

The fourth proportional to 771.06, 1,064.68 and 491.78 is: 679.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    771.06 : 1,064.68 = 491.78 : x
  2. Step 2: Convert to fraction form
    771.06/1,064.68 = 491.78/x
  3. Step 3: Cross multiply
    771.06x = 1,064.68 × 491.78
  4. Step 4: Simplify right side
    771.06x = 523,588.33
  5. Step 5: Solve for x
    x = 523,588.33/771.06
  6. Step 6: Final answer
    x = 679.05

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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.