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Finding the Fourth Proportional to 543.52, 815.69 and 218.89

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Solution

The fourth proportional to 543.52, 815.69 and 218.89 is: 328.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    543.52 : 815.69 = 218.89 : x
  2. Step 2: Convert to fraction form
    543.52/815.69 = 218.89/x
  3. Step 3: Cross multiply
    543.52x = 815.69 × 218.89
  4. Step 4: Simplify right side
    543.52x = 178,546.38
  5. Step 5: Solve for x
    x = 178,546.38/543.52
  6. Step 6: Final answer
    x = 328.50

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1.5x scale

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.