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Finding the Fourth Proportional to 923.68, 1,276.08 and 628.96

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Solution

The fourth proportional to 923.68, 1,276.08 and 628.96 is: 868.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    923.68 : 1,276.08 = 628.96 : x
  2. Step 2: Convert to fraction form
    923.68/1,276.08 = 628.96/x
  3. Step 3: Cross multiply
    923.68x = 1,276.08 × 628.96
  4. Step 4: Simplify right side
    923.68x = 802,603.28
  5. Step 5: Solve for x
    x = 802,603.28/923.68
  6. Step 6: Final answer
    x = 868.92

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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.