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Finding the Fourth Proportional to 801.36, 1,105.11 and 486.68

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Solution

The fourth proportional to 801.36, 1,105.11 and 486.68 is: 671.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    801.36 : 1,105.11 = 486.68 : x
  2. Step 2: Convert to fraction form
    801.36/1,105.11 = 486.68/x
  3. Step 3: Cross multiply
    801.36x = 1,105.11 × 486.68
  4. Step 4: Simplify right side
    801.36x = 537,829.41
  5. Step 5: Solve for x
    x = 537,829.41/801.36
  6. Step 6: Final answer
    x = 671.15

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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.