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Finding the Fourth Proportional to 899.85, 1,241.71 and 663.92

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Solution

The fourth proportional to 899.85, 1,241.71 and 663.92 is: 916.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    899.85 : 1,241.71 = 663.92 : x
  2. Step 2: Convert to fraction form
    899.85/1,241.71 = 663.92/x
  3. Step 3: Cross multiply
    899.85x = 1,241.71 × 663.92
  4. Step 4: Simplify right side
    899.85x = 824,397.55
  5. Step 5: Solve for x
    x = 824,397.55/899.85
  6. Step 6: Final answer
    x = 916.15

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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.