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Finding the Fourth Proportional to 674.10, 928.80 and 637.65

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Solution

The fourth proportional to 674.10, 928.80 and 637.65 is: 878.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    674.10 : 928.80 = 637.65 : x
  2. Step 2: Convert to fraction form
    674.10/928.80 = 637.65/x
  3. Step 3: Cross multiply
    674.10x = 928.80 × 637.65
  4. Step 4: Simplify right side
    674.10x = 592,249.32
  5. Step 5: Solve for x
    x = 592,249.32/674.10
  6. Step 6: Final answer
    x = 878.58

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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.