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Finding the Fourth Proportional to 811.20, 1,119.58 and 496.66

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Solution

The fourth proportional to 811.20, 1,119.58 and 496.66 is: 685.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    811.20 : 1,119.58 = 496.66 : x
  2. Step 2: Convert to fraction form
    811.20/1,119.58 = 496.66/x
  3. Step 3: Cross multiply
    811.20x = 1,119.58 × 496.66
  4. Step 4: Simplify right side
    811.20x = 556,050.60
  5. Step 5: Solve for x
    x = 556,050.60/811.20
  6. Step 6: Final answer
    x = 685.47

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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.