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Finding the Fourth Proportional to 905.16, 1,249.12 and 491.16

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Solution

The fourth proportional to 905.16, 1,249.12 and 491.16 is: 677.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    905.16 : 1,249.12 = 491.16 : x
  2. Step 2: Convert to fraction form
    905.16/1,249.12 = 491.16/x
  3. Step 3: Cross multiply
    905.16x = 1,249.12 × 491.16
  4. Step 4: Simplify right side
    905.16x = 613,510.95
  5. Step 5: Solve for x
    x = 613,510.95/905.16
  6. Step 6: Final answer
    x = 677.80

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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.