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Finding the Fourth Proportional to 935.09, 1,290.74 and 641.21

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Solution

The fourth proportional to 935.09, 1,290.74 and 641.21 is: 885.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    935.09 : 1,290.74 = 641.21 : x
  2. Step 2: Convert to fraction form
    935.09/1,290.74 = 641.21/x
  3. Step 3: Cross multiply
    935.09x = 1,290.74 × 641.21
  4. Step 4: Simplify right side
    935.09x = 827,635.40
  5. Step 5: Solve for x
    x = 827,635.40/935.09
  6. Step 6: Final answer
    x = 885.09

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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.