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Finding the Fourth Proportional to 681.59, 940.32 and 419.15

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Solution

The fourth proportional to 681.59, 940.32 and 419.15 is: 578.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    681.59 : 940.32 = 419.15 : x
  2. Step 2: Convert to fraction form
    681.59/940.32 = 419.15/x
  3. Step 3: Cross multiply
    681.59x = 940.32 × 419.15
  4. Step 4: Simplify right side
    681.59x = 394,130.43
  5. Step 5: Solve for x
    x = 394,130.43/681.59
  6. Step 6: Final answer
    x = 578.26

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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.