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Finding the Fourth Proportional to 714.28, 1,071.57 and 406.28

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Solution

The fourth proportional to 714.28, 1,071.57 and 406.28 is: 609.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    714.28 : 1,071.57 = 406.28 : x
  2. Step 2: Convert to fraction form
    714.28/1,071.57 = 406.28/x
  3. Step 3: Cross multiply
    714.28x = 1,071.57 × 406.28
  4. Step 4: Simplify right side
    714.28x = 435,357.46
  5. Step 5: Solve for x
    x = 435,357.46/714.28
  6. Step 6: Final answer
    x = 609.51

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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.