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Finding the Fourth Proportional to 801.09, 1,105.60 and 486.47

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Solution

The fourth proportional to 801.09, 1,105.60 and 486.47 is: 671.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    801.09 : 1,105.60 = 486.47 : x
  2. Step 2: Convert to fraction form
    801.09/1,105.60 = 486.47/x
  3. Step 3: Cross multiply
    801.09x = 1,105.60 × 486.47
  4. Step 4: Simplify right side
    801.09x = 537,843.69
  5. Step 5: Solve for x
    x = 537,843.69/801.09
  6. Step 6: Final answer
    x = 671.39

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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.