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Finding the Fourth Proportional to 1,390.11, 2,083.12 and 658.15

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Solution

The fourth proportional to 1,390.11, 2,083.12 and 658.15 is: 986.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,390.11 : 2,083.12 = 658.15 : x
  2. Step 2: Convert to fraction form
    1,390.11/2,083.12 = 658.15/x
  3. Step 3: Cross multiply
    1,390.11x = 2,083.12 × 658.15
  4. Step 4: Simplify right side
    1,390.11x = 1,371,004.43
  5. Step 5: Solve for x
    x = 1,371,004.43/1,390.11
  6. Step 6: Final answer
    x = 986.25

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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.