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Finding the Fourth Proportional to 776.40, 1,071.60 and 481.92

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Solution

The fourth proportional to 776.40, 1,071.60 and 481.92 is: 665.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    776.40 : 1,071.60 = 481.92 : x
  2. Step 2: Convert to fraction form
    776.40/1,071.60 = 481.92/x
  3. Step 3: Cross multiply
    776.40x = 1,071.60 × 481.92
  4. Step 4: Simplify right side
    776.40x = 516,425.47
  5. Step 5: Solve for x
    x = 516,425.47/776.40
  6. Step 6: Final answer
    x = 665.15

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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.