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Finding the Fourth Proportional to 2,809.79, 3,875.31 and 2,391.51

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Solution

The fourth proportional to 2,809.79, 3,875.31 and 2,391.51 is: 3,298.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,809.79 : 3,875.31 = 2,391.51 : x
  2. Step 2: Convert to fraction form
    2,809.79/3,875.31 = 2,391.51/x
  3. Step 3: Cross multiply
    2,809.79x = 3,875.31 × 2,391.51
  4. Step 4: Simplify right side
    2,809.79x = 9,267,842.62
  5. Step 5: Solve for x
    x = 9,267,842.62/2,809.79
  6. Step 6: Final answer
    x = 3,298.42

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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.