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Finding the Fourth Proportional to 803.66, 1,109.60 and 505.04

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Solution

The fourth proportional to 803.66, 1,109.60 and 505.04 is: 697.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    803.66 : 1,109.60 = 505.04 : x
  2. Step 2: Convert to fraction form
    803.66/1,109.60 = 505.04/x
  3. Step 3: Cross multiply
    803.66x = 1,109.60 × 505.04
  4. Step 4: Simplify right side
    803.66x = 560,386.20
  5. Step 5: Solve for x
    x = 560,386.20/803.66
  6. Step 6: Final answer
    x = 697.30

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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.