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Finding the Fourth Proportional to 776.02, 1,071.87 and 580.42

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Solution

The fourth proportional to 776.02, 1,071.87 and 580.42 is: 801.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    776.02 : 1,071.87 = 580.42 : x
  2. Step 2: Convert to fraction form
    776.02/1,071.87 = 580.42/x
  3. Step 3: Cross multiply
    776.02x = 1,071.87 × 580.42
  4. Step 4: Simplify right side
    776.02x = 622,134.79
  5. Step 5: Solve for x
    x = 622,134.79/776.02
  6. Step 6: Final answer
    x = 801.70

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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.