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Finding the Fourth Proportional to 979.63, 1,351.67 and 581.41

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Solution

The fourth proportional to 979.63, 1,351.67 and 581.41 is: 802.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    979.63 : 1,351.67 = 581.41 : x
  2. Step 2: Convert to fraction form
    979.63/1,351.67 = 581.41/x
  3. Step 3: Cross multiply
    979.63x = 1,351.67 × 581.41
  4. Step 4: Simplify right side
    979.63x = 785,874.45
  5. Step 5: Solve for x
    x = 785,874.45/979.63
  6. Step 6: Final answer
    x = 802.22

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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.