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Finding the Fourth Proportional to 1,079.62, 1,620.36 and 430.82

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Solution

The fourth proportional to 1,079.62, 1,620.36 and 430.82 is: 646.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,079.62 : 1,620.36 = 430.82 : x
  2. Step 2: Convert to fraction form
    1,079.62/1,620.36 = 430.82/x
  3. Step 3: Cross multiply
    1,079.62x = 1,620.36 × 430.82
  4. Step 4: Simplify right side
    1,079.62x = 698,083.50
  5. Step 5: Solve for x
    x = 698,083.50/1,079.62
  6. Step 6: Final answer
    x = 646.60

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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.