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Finding the Fourth Proportional to 681.04, 939.36 and 419.16

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Solution

The fourth proportional to 681.04, 939.36 and 419.16 is: 578.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    681.04 : 939.36 = 419.16 : x
  2. Step 2: Convert to fraction form
    681.04/939.36 = 419.16/x
  3. Step 3: Cross multiply
    681.04x = 939.36 × 419.16
  4. Step 4: Simplify right side
    681.04x = 393,742.14
  5. Step 5: Solve for x
    x = 393,742.14/681.04
  6. Step 6: Final answer
    x = 578.15

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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.