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Finding the Fourth Proportional to 1,079.14, 1,618.72 and 429.88

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Solution

The fourth proportional to 1,079.14, 1,618.72 and 429.88 is: 644.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,079.14 : 1,618.72 = 429.88 : x
  2. Step 2: Convert to fraction form
    1,079.14/1,618.72 = 429.88/x
  3. Step 3: Cross multiply
    1,079.14x = 1,618.72 × 429.88
  4. Step 4: Simplify right side
    1,079.14x = 695,855.35
  5. Step 5: Solve for x
    x = 695,855.35/1,079.14
  6. Step 6: Final answer
    x = 644.82

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.