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Finding the Fourth Proportional to 968.52, 1,335.78 and 821.64

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Solution

The fourth proportional to 968.52, 1,335.78 and 821.64 is: 1,133.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    968.52 : 1,335.78 = 821.64 : x
  2. Step 2: Convert to fraction form
    968.52/1,335.78 = 821.64/x
  3. Step 3: Cross multiply
    968.52x = 1,335.78 × 821.64
  4. Step 4: Simplify right side
    968.52x = 1,097,530.28
  5. Step 5: Solve for x
    x = 1,097,530.28/968.52
  6. Step 6: Final answer
    x = 1,133.20

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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.