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Finding the Fourth Proportional to 873.09, 1,309.84 and 386.28

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Solution

The fourth proportional to 873.09, 1,309.84 and 386.28 is: 579.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    873.09 : 1,309.84 = 386.28 : x
  2. Step 2: Convert to fraction form
    873.09/1,309.84 = 386.28/x
  3. Step 3: Cross multiply
    873.09x = 1,309.84 × 386.28
  4. Step 4: Simplify right side
    873.09x = 505,969.24
  5. Step 5: Solve for x
    x = 505,969.24/873.09
  6. Step 6: Final answer
    x = 579.51

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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.