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Finding the Fourth Proportional to 1,098.74, 1,513.74 and 903.50

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Solution

The fourth proportional to 1,098.74, 1,513.74 and 903.50 is: 1,244.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,098.74 : 1,513.74 = 903.50 : x
  2. Step 2: Convert to fraction form
    1,098.74/1,513.74 = 903.50/x
  3. Step 3: Cross multiply
    1,098.74x = 1,513.74 × 903.50
  4. Step 4: Simplify right side
    1,098.74x = 1,367,664.09
  5. Step 5: Solve for x
    x = 1,367,664.09/1,098.74
  6. Step 6: Final answer
    x = 1,244.76

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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.