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Finding the Fourth Proportional to 1,190.12, 1,642.38 and 658.99

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Solution

The fourth proportional to 1,190.12, 1,642.38 and 658.99 is: 909.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,190.12 : 1,642.38 = 658.99 : x
  2. Step 2: Convert to fraction form
    1,190.12/1,642.38 = 658.99/x
  3. Step 3: Cross multiply
    1,190.12x = 1,642.38 × 658.99
  4. Step 4: Simplify right side
    1,190.12x = 1,082,314.05
  5. Step 5: Solve for x
    x = 1,082,314.05/1,190.12
  6. Step 6: Final answer
    x = 909.41

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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.