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Finding the Fourth Proportional to 543.85, 815.70 and 153.88

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Solution

The fourth proportional to 543.85, 815.70 and 153.88 is: 230.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    543.85 : 815.70 = 153.88 : x
  2. Step 2: Convert to fraction form
    543.85/815.70 = 153.88/x
  3. Step 3: Cross multiply
    543.85x = 815.70 × 153.88
  4. Step 4: Simplify right side
    543.85x = 125,518.45
  5. Step 5: Solve for x
    x = 125,518.45/543.85
  6. Step 6: Final answer
    x = 230.80

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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.