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Finding the Fourth Proportional to 681.08, 939.85 and 419.09

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Solution

The fourth proportional to 681.08, 939.85 and 419.09 is: 578.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    681.08 : 939.85 = 419.09 : x
  2. Step 2: Convert to fraction form
    681.08/939.85 = 419.09/x
  3. Step 3: Cross multiply
    681.08x = 939.85 × 419.09
  4. Step 4: Simplify right side
    681.08x = 393,875.99
  5. Step 5: Solve for x
    x = 393,875.99/681.08
  6. Step 6: Final answer
    x = 578.32

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Double scale
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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.