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Finding the Fourth Proportional to 776.05, 1,070.99 and 513.88

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Solution

The fourth proportional to 776.05, 1,070.99 and 513.88 is: 709.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    776.05 : 1,070.99 = 513.88 : x
  2. Step 2: Convert to fraction form
    776.05/1,070.99 = 513.88/x
  3. Step 3: Cross multiply
    776.05x = 1,070.99 × 513.88
  4. Step 4: Simplify right side
    776.05x = 550,357.02
  5. Step 5: Solve for x
    x = 550,357.02/776.05
  6. Step 6: Final answer
    x = 709.18

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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.