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Finding the Fourth Proportional to 971.87, 1,341.39 and 579.12

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Solution

The fourth proportional to 971.87, 1,341.39 and 579.12 is: 799.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    971.87 : 1,341.39 = 579.12 : x
  2. Step 2: Convert to fraction form
    971.87/1,341.39 = 579.12/x
  3. Step 3: Cross multiply
    971.87x = 1,341.39 × 579.12
  4. Step 4: Simplify right side
    971.87x = 776,825.78
  5. Step 5: Solve for x
    x = 776,825.78/971.87
  6. Step 6: Final answer
    x = 799.31

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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.