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Finding the Fourth Proportional to 899.39, 1,242.33 and 663.82

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Solution

The fourth proportional to 899.39, 1,242.33 and 663.82 is: 916.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    899.39 : 1,242.33 = 663.82 : x
  2. Step 2: Convert to fraction form
    899.39/1,242.33 = 663.82/x
  3. Step 3: Cross multiply
    899.39x = 1,242.33 × 663.82
  4. Step 4: Simplify right side
    899.39x = 824,677.29
  5. Step 5: Solve for x
    x = 824,677.29/899.39
  6. Step 6: Final answer
    x = 916.93

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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.