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Finding the Fourth Proportional to 872.40, 1,203.28 and 659.64

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Solution

The fourth proportional to 872.40, 1,203.28 and 659.64 is: 909.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    872.40 : 1,203.28 = 659.64 : x
  2. Step 2: Convert to fraction form
    872.40/1,203.28 = 659.64/x
  3. Step 3: Cross multiply
    872.40x = 1,203.28 × 659.64
  4. Step 4: Simplify right side
    872.40x = 793,731.62
  5. Step 5: Solve for x
    x = 793,731.62/872.40
  6. Step 6: Final answer
    x = 909.83

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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.