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Finding the Fourth Proportional to 969.61, 1,335.80 and 674.36

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Solution

The fourth proportional to 969.61, 1,335.80 and 674.36 is: 929.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    969.61 : 1,335.80 = 674.36 : x
  2. Step 2: Convert to fraction form
    969.61/1,335.80 = 674.36/x
  3. Step 3: Cross multiply
    969.61x = 1,335.80 × 674.36
  4. Step 4: Simplify right side
    969.61x = 900,806.72
  5. Step 5: Solve for x
    x = 900,806.72/969.61
  6. Step 6: Final answer
    x = 929.05

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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.