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Finding the Fourth Proportional to 923.72, 1,275.75 and 628.47

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Solution

The fourth proportional to 923.72, 1,275.75 and 628.47 is: 867.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    923.72 : 1,275.75 = 628.47 : x
  2. Step 2: Convert to fraction form
    923.72/1,275.75 = 628.47/x
  3. Step 3: Cross multiply
    923.72x = 1,275.75 × 628.47
  4. Step 4: Simplify right side
    923.72x = 801,770.60
  5. Step 5: Solve for x
    x = 801,770.60/923.72
  6. Step 6: Final answer
    x = 867.98

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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.