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Finding the Fourth Proportional to 803.74, 1,109.21 and 567.78

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Solution

The fourth proportional to 803.74, 1,109.21 and 567.78 is: 783.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    803.74 : 1,109.21 = 567.78 : x
  2. Step 2: Convert to fraction form
    803.74/1,109.21 = 567.78/x
  3. Step 3: Cross multiply
    803.74x = 1,109.21 × 567.78
  4. Step 4: Simplify right side
    803.74x = 629,787.25
  5. Step 5: Solve for x
    x = 629,787.25/803.74
  6. Step 6: Final answer
    x = 783.57

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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.