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Finding the Fourth Proportional to 771.18, 1,064.79 and 616.38

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Solution

The fourth proportional to 771.18, 1,064.79 and 616.38 is: 851.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    771.18 : 1,064.79 = 616.38 : x
  2. Step 2: Convert to fraction form
    771.18/1,064.79 = 616.38/x
  3. Step 3: Cross multiply
    771.18x = 1,064.79 × 616.38
  4. Step 4: Simplify right side
    771.18x = 656,315.26
  5. Step 5: Solve for x
    x = 656,315.26/771.18
  6. Step 6: Final answer
    x = 851.05

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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.