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Finding the Fourth Proportional to 968.42, 1,335.64 and 637.18

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Solution

The fourth proportional to 968.42, 1,335.64 and 637.18 is: 878.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    968.42 : 1,335.64 = 637.18 : x
  2. Step 2: Convert to fraction form
    968.42/1,335.64 = 637.18/x
  3. Step 3: Cross multiply
    968.42x = 1,335.64 × 637.18
  4. Step 4: Simplify right side
    968.42x = 851,039.91
  5. Step 5: Solve for x
    x = 851,039.91/968.42
  6. Step 6: Final answer
    x = 878.80

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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.