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Finding the Fourth Proportional to 522.08, 720.48 and 289.20

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Solution

The fourth proportional to 522.08, 720.48 and 289.20 is: 399.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    522.08 : 720.48 = 289.20 : x
  2. Step 2: Convert to fraction form
    522.08/720.48 = 289.20/x
  3. Step 3: Cross multiply
    522.08x = 720.48 × 289.20
  4. Step 4: Simplify right side
    522.08x = 208,362.82
  5. Step 5: Solve for x
    x = 208,362.82/522.08
  6. Step 6: Final answer
    x = 399.10

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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.