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Finding the Fourth Proportional to 2,099.68, 3,148.80 and 712.64

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Solution

The fourth proportional to 2,099.68, 3,148.80 and 712.64 is: 1,068.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,099.68 : 3,148.80 = 712.64 : x
  2. Step 2: Convert to fraction form
    2,099.68/3,148.80 = 712.64/x
  3. Step 3: Cross multiply
    2,099.68x = 3,148.80 × 712.64
  4. Step 4: Simplify right side
    2,099.68x = 2,243,960.83
  5. Step 5: Solve for x
    x = 2,243,960.83/2,099.68
  6. Step 6: Final answer
    x = 1,068.72

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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.