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Finding the Fourth Proportional to 714.69, 1,070.43 and 620.94

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Solution

The fourth proportional to 714.69, 1,070.43 and 620.94 is: 930.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    714.69 : 1,070.43 = 620.94 : x
  2. Step 2: Convert to fraction form
    714.69/1,070.43 = 620.94/x
  3. Step 3: Cross multiply
    714.69x = 1,070.43 × 620.94
  4. Step 4: Simplify right side
    714.69x = 664,672.80
  5. Step 5: Solve for x
    x = 664,672.80/714.69
  6. Step 6: Final answer
    x = 930.02

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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.