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Finding the Fourth Proportional to 1,291.62, 1,784.25 and 1,029.30

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Solution

The fourth proportional to 1,291.62, 1,784.25 and 1,029.30 is: 1,421.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,291.62 : 1,784.25 = 1,029.30 : x
  2. Step 2: Convert to fraction form
    1,291.62/1,784.25 = 1,029.30/x
  3. Step 3: Cross multiply
    1,291.62x = 1,784.25 × 1,029.30
  4. Step 4: Simplify right side
    1,291.62x = 1,836,528.53
  5. Step 5: Solve for x
    x = 1,836,528.53/1,291.62
  6. Step 6: Final answer
    x = 1,421.88

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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.