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Finding the Fourth Proportional to 681.03, 939.54 and 419.19

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Solution

The fourth proportional to 681.03, 939.54 and 419.19 is: 578.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    681.03 : 939.54 = 419.19 : x
  2. Step 2: Convert to fraction form
    681.03/939.54 = 419.19/x
  3. Step 3: Cross multiply
    681.03x = 939.54 × 419.19
  4. Step 4: Simplify right side
    681.03x = 393,845.77
  5. Step 5: Solve for x
    x = 393,845.77/681.03
  6. Step 6: Final answer
    x = 578.31

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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.