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Finding the Fourth Proportional to 1,189.80, 1,642.02 and 658.72

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Solution

The fourth proportional to 1,189.80, 1,642.02 and 658.72 is: 909.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,189.80 : 1,642.02 = 658.72 : x
  2. Step 2: Convert to fraction form
    1,189.80/1,642.02 = 658.72/x
  3. Step 3: Cross multiply
    1,189.80x = 1,642.02 × 658.72
  4. Step 4: Simplify right side
    1,189.80x = 1,081,631.41
  5. Step 5: Solve for x
    x = 1,081,631.41/1,189.80
  6. Step 6: Final answer
    x = 909.09

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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.