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Finding the Fourth Proportional to 1,161.72, 1,740.78 and 675

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Solution

The fourth proportional to 1,161.72, 1,740.78 and 675 is: 1,011.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,161.72 : 1,740.78 = 675 : x
  2. Step 2: Convert to fraction form
    1,161.72/1,740.78 = 675/x
  3. Step 3: Cross multiply
    1,161.72x = 1,740.78 × 675
  4. Step 4: Simplify right side
    1,161.72x = 1,175,026.50
  5. Step 5: Solve for x
    x = 1,175,026.50/1,161.72
  6. Step 6: Final answer
    x = 1,011.45

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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.