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Finding the Fourth Proportional to 3,808.62, 5,254.71 and 2,129.79

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Solution

The fourth proportional to 3,808.62, 5,254.71 and 2,129.79 is: 2,938.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,808.62 : 5,254.71 = 2,129.79 : x
  2. Step 2: Convert to fraction form
    3,808.62/5,254.71 = 2,129.79/x
  3. Step 3: Cross multiply
    3,808.62x = 5,254.71 × 2,129.79
  4. Step 4: Simplify right side
    3,808.62x = 11,191,428.81
  5. Step 5: Solve for x
    x = 11,191,428.81/3,808.62
  6. Step 6: Final answer
    x = 2,938.45

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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.