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Finding the Fourth Proportional to 1,068.64, 1,604.79 and 660.19

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Solution

The fourth proportional to 1,068.64, 1,604.79 and 660.19 is: 991.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,068.64 : 1,604.79 = 660.19 : x
  2. Step 2: Convert to fraction form
    1,068.64/1,604.79 = 660.19/x
  3. Step 3: Cross multiply
    1,068.64x = 1,604.79 × 660.19
  4. Step 4: Simplify right side
    1,068.64x = 1,059,466.31
  5. Step 5: Solve for x
    x = 1,059,466.31/1,068.64
  6. Step 6: Final answer
    x = 991.42

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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.