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Finding the Fourth Proportional to 811.11, 1,119.70 and 531.35

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Solution

The fourth proportional to 811.11, 1,119.70 and 531.35 is: 733.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    811.11 : 1,119.70 = 531.35 : x
  2. Step 2: Convert to fraction form
    811.11/1,119.70 = 531.35/x
  3. Step 3: Cross multiply
    811.11x = 1,119.70 × 531.35
  4. Step 4: Simplify right side
    811.11x = 594,952.60
  5. Step 5: Solve for x
    x = 594,952.60/811.11
  6. Step 6: Final answer
    x = 733.50

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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.