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Finding the Fourth Proportional to 776.13, 1,070.87 and 461.31

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Solution

The fourth proportional to 776.13, 1,070.87 and 461.31 is: 636.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    776.13 : 1,070.87 = 461.31 : x
  2. Step 2: Convert to fraction form
    776.13/1,070.87 = 461.31/x
  3. Step 3: Cross multiply
    776.13x = 1,070.87 × 461.31
  4. Step 4: Simplify right side
    776.13x = 494,000.73
  5. Step 5: Solve for x
    x = 494,000.73/776.13
  6. Step 6: Final answer
    x = 636.49

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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.