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Finding the Fourth Proportional to 3,911.61, 5,398.02 and 2,143.20

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Solution

The fourth proportional to 3,911.61, 5,398.02 and 2,143.20 is: 2,957.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,911.61 : 5,398.02 = 2,143.20 : x
  2. Step 2: Convert to fraction form
    3,911.61/5,398.02 = 2,143.20/x
  3. Step 3: Cross multiply
    3,911.61x = 5,398.02 × 2,143.20
  4. Step 4: Simplify right side
    3,911.61x = 11,569,036.46
  5. Step 5: Solve for x
    x = 11,569,036.46/3,911.61
  6. Step 6: Final answer
    x = 2,957.62

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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.