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Finding the Fourth Proportional to 868.84, 1,198.72 and 669.84

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Solution

The fourth proportional to 868.84, 1,198.72 and 669.84 is: 924.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    868.84 : 1,198.72 = 669.84 : x
  2. Step 2: Convert to fraction form
    868.84/1,198.72 = 669.84/x
  3. Step 3: Cross multiply
    868.84x = 1,198.72 × 669.84
  4. Step 4: Simplify right side
    868.84x = 802,950.60
  5. Step 5: Solve for x
    x = 802,950.60/868.84
  6. Step 6: Final answer
    x = 924.16

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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.