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Finding the Fourth Proportional to 885.72, 1,328.62 and 543

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Solution

The fourth proportional to 885.72, 1,328.62 and 543 is: 814.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    885.72 : 1,328.62 = 543 : x
  2. Step 2: Convert to fraction form
    885.72/1,328.62 = 543/x
  3. Step 3: Cross multiply
    885.72x = 1,328.62 × 543
  4. Step 4: Simplify right side
    885.72x = 721,440.66
  5. Step 5: Solve for x
    x = 721,440.66/885.72
  6. Step 6: Final answer
    x = 814.52

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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.