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Finding the Fourth Proportional to 967.76, 1,335.91 and 688.04

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Solution

The fourth proportional to 967.76, 1,335.91 and 688.04 is: 949.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    967.76 : 1,335.91 = 688.04 : x
  2. Step 2: Convert to fraction form
    967.76/1,335.91 = 688.04/x
  3. Step 3: Cross multiply
    967.76x = 1,335.91 × 688.04
  4. Step 4: Simplify right side
    967.76x = 919,159.52
  5. Step 5: Solve for x
    x = 919,159.52/967.76
  6. Step 6: Final answer
    x = 949.78

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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.