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Finding the Fourth Proportional to 885.38, 1,220.91 and 620.06

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Solution

The fourth proportional to 885.38, 1,220.91 and 620.06 is: 855.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    885.38 : 1,220.91 = 620.06 : x
  2. Step 2: Convert to fraction form
    885.38/1,220.91 = 620.06/x
  3. Step 3: Cross multiply
    885.38x = 1,220.91 × 620.06
  4. Step 4: Simplify right side
    885.38x = 757,037.45
  5. Step 5: Solve for x
    x = 757,037.45/885.38
  6. Step 6: Final answer
    x = 855.04

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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.