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Finding the Fourth Proportional to 522.51, 720.99 and 289.64

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Solution

The fourth proportional to 522.51, 720.99 and 289.64 is: 399.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    522.51 : 720.99 = 289.64 : x
  2. Step 2: Convert to fraction form
    522.51/720.99 = 289.64/x
  3. Step 3: Cross multiply
    522.51x = 720.99 × 289.64
  4. Step 4: Simplify right side
    522.51x = 208,823.94
  5. Step 5: Solve for x
    x = 208,823.94/522.51
  6. Step 6: Final answer
    x = 399.66

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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.