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Finding the Fourth Proportional to 522.36, 720.80 and 289.48

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Solution

The fourth proportional to 522.36, 720.80 and 289.48 is: 399.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    522.36 : 720.80 = 289.48 : x
  2. Step 2: Convert to fraction form
    522.36/720.80 = 289.48/x
  3. Step 3: Cross multiply
    522.36x = 720.80 × 289.48
  4. Step 4: Simplify right side
    522.36x = 208,657.18
  5. Step 5: Solve for x
    x = 208,657.18/522.36
  6. Step 6: Final answer
    x = 399.45

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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.