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Finding the Fourth Proportional to 776.72, 1,071.94 and 514.28

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Solution

The fourth proportional to 776.72, 1,071.94 and 514.28 is: 709.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    776.72 : 1,071.94 = 514.28 : x
  2. Step 2: Convert to fraction form
    776.72/1,071.94 = 514.28/x
  3. Step 3: Cross multiply
    776.72x = 1,071.94 × 514.28
  4. Step 4: Simplify right side
    776.72x = 551,277.30
  5. Step 5: Solve for x
    x = 551,277.30/776.72
  6. Step 6: Final answer
    x = 709.75

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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.