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Finding the Fourth Proportional to 714.29, 985.71 and 419.56

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Solution

The fourth proportional to 714.29, 985.71 and 419.56 is: 578.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    714.29 : 985.71 = 419.56 : x
  2. Step 2: Convert to fraction form
    714.29/985.71 = 419.56/x
  3. Step 3: Cross multiply
    714.29x = 985.71 × 419.56
  4. Step 4: Simplify right side
    714.29x = 413,564.49
  5. Step 5: Solve for x
    x = 413,564.49/714.29
  6. Step 6: Final answer
    x = 578.99

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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.