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Finding the Fourth Proportional to 2,807.66, 3,873.48 and 1,688.87

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Solution

The fourth proportional to 2,807.66, 3,873.48 and 1,688.87 is: 2,329.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,807.66 : 3,873.48 = 1,688.87 : x
  2. Step 2: Convert to fraction form
    2,807.66/3,873.48 = 1,688.87/x
  3. Step 3: Cross multiply
    2,807.66x = 3,873.48 × 1,688.87
  4. Step 4: Simplify right side
    2,807.66x = 6,541,784.80
  5. Step 5: Solve for x
    x = 6,541,784.80/2,807.66
  6. Step 6: Final answer
    x = 2,329.98

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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.