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Finding the Fourth Proportional to 873.20, 1,309.80 and 729.20

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Solution

The fourth proportional to 873.20, 1,309.80 and 729.20 is: 1,093.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    873.20 : 1,309.80 = 729.20 : x
  2. Step 2: Convert to fraction form
    873.20/1,309.80 = 729.20/x
  3. Step 3: Cross multiply
    873.20x = 1,309.80 × 729.20
  4. Step 4: Simplify right side
    873.20x = 955,106.16
  5. Step 5: Solve for x
    x = 955,106.16/873.20
  6. Step 6: Final answer
    x = 1,093.80

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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.