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Finding the Fourth Proportional to 800.69, 1,105.65 and 670.68

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Solution

The fourth proportional to 800.69, 1,105.65 and 670.68 is: 926.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    800.69 : 1,105.65 = 670.68 : x
  2. Step 2: Convert to fraction form
    800.69/1,105.65 = 670.68/x
  3. Step 3: Cross multiply
    800.69x = 1,105.65 × 670.68
  4. Step 4: Simplify right side
    800.69x = 741,537.34
  5. Step 5: Solve for x
    x = 741,537.34/800.69
  6. Step 6: Final answer
    x = 926.13

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1.5x scale

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.