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Finding the Fourth Proportional to 921.69, 1,272.39 and 628.50

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Solution

The fourth proportional to 921.69, 1,272.39 and 628.50 is: 867.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    921.69 : 1,272.39 = 628.50 : x
  2. Step 2: Convert to fraction form
    921.69/1,272.39 = 628.50/x
  3. Step 3: Cross multiply
    921.69x = 1,272.39 × 628.50
  4. Step 4: Simplify right side
    921.69x = 799,697.12
  5. Step 5: Solve for x
    x = 799,697.12/921.69
  6. Step 6: Final answer
    x = 867.64

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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.