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Finding the Fourth Proportional to 570.45, 853.92 and 487.43

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Solution

The fourth proportional to 570.45, 853.92 and 487.43 is: 729.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    570.45 : 853.92 = 487.43 : x
  2. Step 2: Convert to fraction form
    570.45/853.92 = 487.43/x
  3. Step 3: Cross multiply
    570.45x = 853.92 × 487.43
  4. Step 4: Simplify right side
    570.45x = 416,226.23
  5. Step 5: Solve for x
    x = 416,226.23/570.45
  6. Step 6: Final answer
    x = 729.65

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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.