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Finding the Fourth Proportional to 2,857.86, 3,943.92 and 1,678.92

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Solution

The fourth proportional to 2,857.86, 3,943.92 and 1,678.92 is: 2,316.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,857.86 : 3,943.92 = 1,678.92 : x
  2. Step 2: Convert to fraction form
    2,857.86/3,943.92 = 1,678.92/x
  3. Step 3: Cross multiply
    2,857.86x = 3,943.92 × 1,678.92
  4. Step 4: Simplify right side
    2,857.86x = 6,621,526.17
  5. Step 5: Solve for x
    x = 6,621,526.17/2,857.86
  6. Step 6: Final answer
    x = 2,316.95

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1.5x scale

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.