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Finding the Fourth Proportional to 620.76, 855.60 and 443.76

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Solution

The fourth proportional to 620.76, 855.60 and 443.76 is: 611.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    620.76 : 855.60 = 443.76 : x
  2. Step 2: Convert to fraction form
    620.76/855.60 = 443.76/x
  3. Step 3: Cross multiply
    620.76x = 855.60 × 443.76
  4. Step 4: Simplify right side
    620.76x = 379,681.06
  5. Step 5: Solve for x
    x = 379,681.06/620.76
  6. Step 6: Final answer
    x = 611.64

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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.