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Finding the Fourth Proportional to 968.40, 1,336.08 and 688.68

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Solution

The fourth proportional to 968.40, 1,336.08 and 688.68 is: 950.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    968.40 : 1,336.08 = 688.68 : x
  2. Step 2: Convert to fraction form
    968.40/1,336.08 = 688.68/x
  3. Step 3: Cross multiply
    968.40x = 1,336.08 × 688.68
  4. Step 4: Simplify right side
    968.40x = 920,131.57
  5. Step 5: Solve for x
    x = 920,131.57/968.40
  6. Step 6: Final answer
    x = 950.16

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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.