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Finding the Fourth Proportional to 2,805.77, 3,871.43 and 1,686.32

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Solution

The fourth proportional to 2,805.77, 3,871.43 and 1,686.32 is: 2,326.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,805.77 : 3,871.43 = 1,686.32 : x
  2. Step 2: Convert to fraction form
    2,805.77/3,871.43 = 1,686.32/x
  3. Step 3: Cross multiply
    2,805.77x = 3,871.43 × 1,686.32
  4. Step 4: Simplify right side
    2,805.77x = 6,528,462.89
  5. Step 5: Solve for x
    x = 6,528,462.89/2,805.77
  6. Step 6: Final answer
    x = 2,326.80

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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.