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Finding the Fourth Proportional to 968.63, 1,335.30 and 636.49

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Solution

The fourth proportional to 968.63, 1,335.30 and 636.49 is: 877.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    968.63 : 1,335.30 = 636.49 : x
  2. Step 2: Convert to fraction form
    968.63/1,335.30 = 636.49/x
  3. Step 3: Cross multiply
    968.63x = 1,335.30 × 636.49
  4. Step 4: Simplify right side
    968.63x = 849,898.42
  5. Step 5: Solve for x
    x = 849,898.42/968.63
  6. Step 6: Final answer
    x = 877.42

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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.