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Finding the Fourth Proportional to 1,091.46, 1,505.75 and 671.67

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Solution

The fourth proportional to 1,091.46, 1,505.75 and 671.67 is: 926.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,091.46 : 1,505.75 = 671.67 : x
  2. Step 2: Convert to fraction form
    1,091.46/1,505.75 = 671.67/x
  3. Step 3: Cross multiply
    1,091.46x = 1,505.75 × 671.67
  4. Step 4: Simplify right side
    1,091.46x = 1,011,363.74
  5. Step 5: Solve for x
    x = 1,011,363.74/1,091.46
  6. Step 6: Final answer
    x = 926.62

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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.