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Finding the Fourth Proportional to 861.63, 1,188.32 and 581.79

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Solution

The fourth proportional to 861.63, 1,188.32 and 581.79 is: 802.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    861.63 : 1,188.32 = 581.79 : x
  2. Step 2: Convert to fraction form
    861.63/1,188.32 = 581.79/x
  3. Step 3: Cross multiply
    861.63x = 1,188.32 × 581.79
  4. Step 4: Simplify right side
    861.63x = 691,349.78
  5. Step 5: Solve for x
    x = 691,349.78/861.63
  6. Step 6: Final answer
    x = 802.37

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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.