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Finding the Fourth Proportional to 868.64, 1,195.76 and 646.88

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Solution

The fourth proportional to 868.64, 1,195.76 and 646.88 is: 890.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    868.64 : 1,195.76 = 646.88 : x
  2. Step 2: Convert to fraction form
    868.64/1,195.76 = 646.88/x
  3. Step 3: Cross multiply
    868.64x = 1,195.76 × 646.88
  4. Step 4: Simplify right side
    868.64x = 773,513.23
  5. Step 5: Solve for x
    x = 773,513.23/868.64
  6. Step 6: Final answer
    x = 890.49

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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.