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Finding the Fourth Proportional to 873.32, 1,205.33 and 611.15

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Solution

The fourth proportional to 873.32, 1,205.33 and 611.15 is: 843.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    873.32 : 1,205.33 = 611.15 : x
  2. Step 2: Convert to fraction form
    873.32/1,205.33 = 611.15/x
  3. Step 3: Cross multiply
    873.32x = 1,205.33 × 611.15
  4. Step 4: Simplify right side
    873.32x = 736,628.35
  5. Step 5: Solve for x
    x = 736,628.35/873.32
  6. Step 6: Final answer
    x = 843.49

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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.