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Finding the Fourth Proportional to 1,320.09, 1,821.72 and 730.64

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Solution

The fourth proportional to 1,320.09, 1,821.72 and 730.64 is: 1,008.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,320.09 : 1,821.72 = 730.64 : x
  2. Step 2: Convert to fraction form
    1,320.09/1,821.72 = 730.64/x
  3. Step 3: Cross multiply
    1,320.09x = 1,821.72 × 730.64
  4. Step 4: Simplify right side
    1,320.09x = 1,331,021.50
  5. Step 5: Solve for x
    x = 1,331,021.50/1,320.09
  6. Step 6: Final answer
    x = 1,008.28

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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.