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Finding the Fourth Proportional to 714.56, 1,070.81 and 421.37

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Solution

The fourth proportional to 714.56, 1,070.81 and 421.37 is: 631.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    714.56 : 1,070.81 = 421.37 : x
  2. Step 2: Convert to fraction form
    714.56/1,070.81 = 421.37/x
  3. Step 3: Cross multiply
    714.56x = 1,070.81 × 421.37
  4. Step 4: Simplify right side
    714.56x = 451,205.10
  5. Step 5: Solve for x
    x = 451,205.10/714.56
  6. Step 6: Final answer
    x = 631.44

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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.