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Finding the Fourth Proportional to 522.39, 720.99 and 312.50

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Solution

The fourth proportional to 522.39, 720.99 and 312.50 is: 431.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    522.39 : 720.99 = 312.50 : x
  2. Step 2: Convert to fraction form
    522.39/720.99 = 312.50/x
  3. Step 3: Cross multiply
    522.39x = 720.99 × 312.50
  4. Step 4: Simplify right side
    522.39x = 225,309.38
  5. Step 5: Solve for x
    x = 225,309.38/522.39
  6. Step 6: Final answer
    x = 431.30

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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.