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Finding the Fourth Proportional to 898.93, 1,240.94 and 663.36

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Solution

The fourth proportional to 898.93, 1,240.94 and 663.36 is: 915.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    898.93 : 1,240.94 = 663.36 : x
  2. Step 2: Convert to fraction form
    898.93/1,240.94 = 663.36/x
  3. Step 3: Cross multiply
    898.93x = 1,240.94 × 663.36
  4. Step 4: Simplify right side
    898.93x = 823,189.96
  5. Step 5: Solve for x
    x = 823,189.96/898.93
  6. Step 6: Final answer
    x = 915.74

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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.