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Finding the Fourth Proportional to 714.28, 985.91 and 415.59

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Solution

The fourth proportional to 714.28, 985.91 and 415.59 is: 573.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    714.28 : 985.91 = 415.59 : x
  2. Step 2: Convert to fraction form
    714.28/985.91 = 415.59/x
  3. Step 3: Cross multiply
    714.28x = 985.91 × 415.59
  4. Step 4: Simplify right side
    714.28x = 409,736.80
  5. Step 5: Solve for x
    x = 409,736.80/714.28
  6. Step 6: Final answer
    x = 573.64

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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.