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Finding the Fourth Proportional to 990.99, 1,368.72 and 658.85

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Solution

The fourth proportional to 990.99, 1,368.72 and 658.85 is: 909.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.99 : 1,368.72 = 658.85 : x
  2. Step 2: Convert to fraction form
    990.99/1,368.72 = 658.85/x
  3. Step 3: Cross multiply
    990.99x = 1,368.72 × 658.85
  4. Step 4: Simplify right side
    990.99x = 901,774.33
  5. Step 5: Solve for x
    x = 901,774.33/990.99
  6. Step 6: Final answer
    x = 909.97

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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.