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Finding the Fourth Proportional to 1,603.71, 2,408.31 and 991.04

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Solution

The fourth proportional to 1,603.71, 2,408.31 and 991.04 is: 1,488.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,603.71 : 2,408.31 = 991.04 : x
  2. Step 2: Convert to fraction form
    1,603.71/2,408.31 = 991.04/x
  3. Step 3: Cross multiply
    1,603.71x = 2,408.31 × 991.04
  4. Step 4: Simplify right side
    1,603.71x = 2,386,719.50
  5. Step 5: Solve for x
    x = 2,386,719.50/1,603.71
  6. Step 6: Final answer
    x = 1,488.25

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.