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Finding the Fourth Proportional to 714.26, 985.28 and 419.47

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Solution

The fourth proportional to 714.26, 985.28 and 419.47 is: 578.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    714.26 : 985.28 = 419.47 : x
  2. Step 2: Convert to fraction form
    714.26/985.28 = 419.47/x
  3. Step 3: Cross multiply
    714.26x = 985.28 × 419.47
  4. Step 4: Simplify right side
    714.26x = 413,295.40
  5. Step 5: Solve for x
    x = 413,295.40/714.26
  6. Step 6: Final answer
    x = 578.63

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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.