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Finding the Fourth Proportional to 522.99, 720.07 and 398.25

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Solution

The fourth proportional to 522.99, 720.07 and 398.25 is: 548.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    522.99 : 720.07 = 398.25 : x
  2. Step 2: Convert to fraction form
    522.99/720.07 = 398.25/x
  3. Step 3: Cross multiply
    522.99x = 720.07 × 398.25
  4. Step 4: Simplify right side
    522.99x = 286,767.88
  5. Step 5: Solve for x
    x = 286,767.88/522.99
  6. Step 6: Final answer
    x = 548.32

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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.