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Finding the Fourth Proportional to 1,963.61, 2,709.80 and 1,079.40

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Solution

The fourth proportional to 1,963.61, 2,709.80 and 1,079.40 is: 1,489.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,963.61 : 2,709.80 = 1,079.40 : x
  2. Step 2: Convert to fraction form
    1,963.61/2,709.80 = 1,079.40/x
  3. Step 3: Cross multiply
    1,963.61x = 2,709.80 × 1,079.40
  4. Step 4: Simplify right side
    1,963.61x = 2,924,952.72
  5. Step 5: Solve for x
    x = 2,924,952.72/1,963.61
  6. Step 6: Final answer
    x = 1,489.58

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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.