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Finding the Fourth Proportional to 1,079.41, 1,618.84 and 421.06

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Solution

The fourth proportional to 1,079.41, 1,618.84 and 421.06 is: 631.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,079.41 : 1,618.84 = 421.06 : x
  2. Step 2: Convert to fraction form
    1,079.41/1,618.84 = 421.06/x
  3. Step 3: Cross multiply
    1,079.41x = 1,618.84 × 421.06
  4. Step 4: Simplify right side
    1,079.41x = 681,628.77
  5. Step 5: Solve for x
    x = 681,628.77/1,079.41
  6. Step 6: Final answer
    x = 631.48

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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.