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Finding the Fourth Proportional to 1,080.33, 1,620.45 and 430.62

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Solution

The fourth proportional to 1,080.33, 1,620.45 and 430.62 is: 645.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,080.33 : 1,620.45 = 430.62 : x
  2. Step 2: Convert to fraction form
    1,080.33/1,620.45 = 430.62/x
  3. Step 3: Cross multiply
    1,080.33x = 1,620.45 × 430.62
  4. Step 4: Simplify right side
    1,080.33x = 697,798.18
  5. Step 5: Solve for x
    x = 697,798.18/1,080.33
  6. Step 6: Final answer
    x = 645.91

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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.