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Finding the Fourth Proportional to 713.72, 985.17 and 419.07

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Solution

The fourth proportional to 713.72, 985.17 and 419.07 is: 578.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    713.72 : 985.17 = 419.07 : x
  2. Step 2: Convert to fraction form
    713.72/985.17 = 419.07/x
  3. Step 3: Cross multiply
    713.72x = 985.17 × 419.07
  4. Step 4: Simplify right side
    713.72x = 412,855.19
  5. Step 5: Solve for x
    x = 412,855.19/713.72
  6. Step 6: Final answer
    x = 578.46

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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.