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Finding the Fourth Proportional to 988.92, 1,364.22 and 674.10

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Solution

The fourth proportional to 988.92, 1,364.22 and 674.10 is: 929.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    988.92 : 1,364.22 = 674.10 : x
  2. Step 2: Convert to fraction form
    988.92/1,364.22 = 674.10/x
  3. Step 3: Cross multiply
    988.92x = 1,364.22 × 674.10
  4. Step 4: Simplify right side
    988.92x = 919,620.70
  5. Step 5: Solve for x
    x = 919,620.70/988.92
  6. Step 6: Final answer
    x = 929.92

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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.