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Finding the Fourth Proportional to 2,712.64, 4,068.94 and 660.64

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Solution

The fourth proportional to 2,712.64, 4,068.94 and 660.64 is: 990.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,712.64 : 4,068.94 = 660.64 : x
  2. Step 2: Convert to fraction form
    2,712.64/4,068.94 = 660.64/x
  3. Step 3: Cross multiply
    2,712.64x = 4,068.94 × 660.64
  4. Step 4: Simplify right side
    2,712.64x = 2,688,104.52
  5. Step 5: Solve for x
    x = 2,688,104.52/2,712.64
  6. Step 6: Final answer
    x = 990.96

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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.