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Finding the Fourth Proportional to 522.71, 721.31 and 312.84

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Solution

The fourth proportional to 522.71, 721.31 and 312.84 is: 431.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    522.71 : 721.31 = 312.84 : x
  2. Step 2: Convert to fraction form
    522.71/721.31 = 312.84/x
  3. Step 3: Cross multiply
    522.71x = 721.31 × 312.84
  4. Step 4: Simplify right side
    522.71x = 225,653.06
  5. Step 5: Solve for x
    x = 225,653.06/522.71
  6. Step 6: Final answer
    x = 431.70

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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.