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Finding the Fourth Proportional to 3,807.76, 5,711.64 and 1,210.92

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Solution

The fourth proportional to 3,807.76, 5,711.64 and 1,210.92 is: 1,816.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,807.76 : 5,711.64 = 1,210.92 : x
  2. Step 2: Convert to fraction form
    3,807.76/5,711.64 = 1,210.92/x
  3. Step 3: Cross multiply
    3,807.76x = 5,711.64 × 1,210.92
  4. Step 4: Simplify right side
    3,807.76x = 6,916,339.11
  5. Step 5: Solve for x
    x = 6,916,339.11/3,807.76
  6. Step 6: Final answer
    x = 1,816.38

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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.