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Finding the Fourth Proportional to 543.25, 815.91 and 521.07

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Solution

The fourth proportional to 543.25, 815.91 and 521.07 is: 782.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    543.25 : 815.91 = 521.07 : x
  2. Step 2: Convert to fraction form
    543.25/815.91 = 521.07/x
  3. Step 3: Cross multiply
    543.25x = 815.91 × 521.07
  4. Step 4: Simplify right side
    543.25x = 425,146.22
  5. Step 5: Solve for x
    x = 425,146.22/543.25
  6. Step 6: Final answer
    x = 782.60

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.