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Finding the Fourth Proportional to 2,660.05, 3,989.76 and 712.40

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Solution

The fourth proportional to 2,660.05, 3,989.76 and 712.40 is: 1,068.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,660.05 : 3,989.76 = 712.40 : x
  2. Step 2: Convert to fraction form
    2,660.05/3,989.76 = 712.40/x
  3. Step 3: Cross multiply
    2,660.05x = 3,989.76 × 712.40
  4. Step 4: Simplify right side
    2,660.05x = 2,842,305.02
  5. Step 5: Solve for x
    x = 2,842,305.02/2,660.05
  6. Step 6: Final answer
    x = 1,068.52

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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.