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Finding the Fourth Proportional to 876.44, 1,209.09 and 581.91

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Solution

The fourth proportional to 876.44, 1,209.09 and 581.91 is: 802.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    876.44 : 1,209.09 = 581.91 : x
  2. Step 2: Convert to fraction form
    876.44/1,209.09 = 581.91/x
  3. Step 3: Cross multiply
    876.44x = 1,209.09 × 581.91
  4. Step 4: Simplify right side
    876.44x = 703,581.56
  5. Step 5: Solve for x
    x = 703,581.56/876.44
  6. Step 6: Final answer
    x = 802.77

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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.