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Finding the Fourth Proportional to 776.42, 1,071.88 and 514.88

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Solution

The fourth proportional to 776.42, 1,071.88 and 514.88 is: 710.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    776.42 : 1,071.88 = 514.88 : x
  2. Step 2: Convert to fraction form
    776.42/1,071.88 = 514.88/x
  3. Step 3: Cross multiply
    776.42x = 1,071.88 × 514.88
  4. Step 4: Simplify right side
    776.42x = 551,889.57
  5. Step 5: Solve for x
    x = 551,889.57/776.42
  6. Step 6: Final answer
    x = 710.81

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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.