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Finding the Fourth Proportional to 737.80, 1,106.70 and 689.80

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Solution

The fourth proportional to 737.80, 1,106.70 and 689.80 is: 1,034.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    737.80 : 1,106.70 = 689.80 : x
  2. Step 2: Convert to fraction form
    737.80/1,106.70 = 689.80/x
  3. Step 3: Cross multiply
    737.80x = 1,106.70 × 689.80
  4. Step 4: Simplify right side
    737.80x = 763,401.66
  5. Step 5: Solve for x
    x = 763,401.66/737.80
  6. Step 6: Final answer
    x = 1,034.70

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.