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Finding the Fourth Proportional to 825.76, 1,239.54 and 436.24

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Solution

The fourth proportional to 825.76, 1,239.54 and 436.24 is: 654.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    825.76 : 1,239.54 = 436.24 : x
  2. Step 2: Convert to fraction form
    825.76/1,239.54 = 436.24/x
  3. Step 3: Cross multiply
    825.76x = 1,239.54 × 436.24
  4. Step 4: Simplify right side
    825.76x = 540,736.93
  5. Step 5: Solve for x
    x = 540,736.93/825.76
  6. Step 6: Final answer
    x = 654.84

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.