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Finding the Fourth Proportional to 570.20, 786.93 and 321.55

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Solution

The fourth proportional to 570.20, 786.93 and 321.55 is: 443.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    570.20 : 786.93 = 321.55 : x
  2. Step 2: Convert to fraction form
    570.20/786.93 = 321.55/x
  3. Step 3: Cross multiply
    570.20x = 786.93 × 321.55
  4. Step 4: Simplify right side
    570.20x = 253,031.80
  5. Step 5: Solve for x
    x = 253,031.80/570.20
  6. Step 6: Final answer
    x = 443.76

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.