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Finding the Fourth Proportional to 899.47, 1,241.19 and 663.55

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Solution

The fourth proportional to 899.47, 1,241.19 and 663.55 is: 915.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    899.47 : 1,241.19 = 663.55 : x
  2. Step 2: Convert to fraction form
    899.47/1,241.19 = 663.55/x
  3. Step 3: Cross multiply
    899.47x = 1,241.19 × 663.55
  4. Step 4: Simplify right side
    899.47x = 823,593.71
  5. Step 5: Solve for x
    x = 823,593.71/899.47
  6. Step 6: Final answer
    x = 915.64

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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.