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Finding the Fourth Proportional to 521.93, 720.26 and 289.05

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Solution

The fourth proportional to 521.93, 720.26 and 289.05 is: 398.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.93 : 720.26 = 289.05 : x
  2. Step 2: Convert to fraction form
    521.93/720.26 = 289.05/x
  3. Step 3: Cross multiply
    521.93x = 720.26 × 289.05
  4. Step 4: Simplify right side
    521.93x = 208,189.71
  5. Step 5: Solve for x
    x = 208,189.71/521.93
  6. Step 6: Final answer
    x = 398.89

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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.