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Finding the Fourth Proportional to 713.96, 985.30 and 419.22

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Solution

The fourth proportional to 713.96, 985.30 and 419.22 is: 578.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    713.96 : 985.30 = 419.22 : x
  2. Step 2: Convert to fraction form
    713.96/985.30 = 419.22/x
  3. Step 3: Cross multiply
    713.96x = 985.30 × 419.22
  4. Step 4: Simplify right side
    713.96x = 413,057.47
  5. Step 5: Solve for x
    x = 413,057.47/713.96
  6. Step 6: Final answer
    x = 578.54

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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.