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Finding the Fourth Proportional to 803.45, 1,109.30 and 505.15

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Solution

The fourth proportional to 803.45, 1,109.30 and 505.15 is: 697.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    803.45 : 1,109.30 = 505.15 : x
  2. Step 2: Convert to fraction form
    803.45/1,109.30 = 505.15/x
  3. Step 3: Cross multiply
    803.45x = 1,109.30 × 505.15
  4. Step 4: Simplify right side
    803.45x = 560,357.60
  5. Step 5: Solve for x
    x = 560,357.60/803.45
  6. Step 6: Final answer
    x = 697.44

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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.