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Finding the Fourth Proportional to 899.48, 1,240.91 and 663.99

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Solution

The fourth proportional to 899.48, 1,240.91 and 663.99 is: 916.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    899.48 : 1,240.91 = 663.99 : x
  2. Step 2: Convert to fraction form
    899.48/1,240.91 = 663.99/x
  3. Step 3: Cross multiply
    899.48x = 1,240.91 × 663.99
  4. Step 4: Simplify right side
    899.48x = 823,948.51
  5. Step 5: Solve for x
    x = 823,948.51/899.48
  6. Step 6: Final answer
    x = 916.03

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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.