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Finding the Fourth Proportional to 570.81, 855.42 and 261.89

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Solution

The fourth proportional to 570.81, 855.42 and 261.89 is: 392.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    570.81 : 855.42 = 261.89 : x
  2. Step 2: Convert to fraction form
    570.81/855.42 = 261.89/x
  3. Step 3: Cross multiply
    570.81x = 855.42 × 261.89
  4. Step 4: Simplify right side
    570.81x = 224,025.94
  5. Step 5: Solve for x
    x = 224,025.94/570.81
  6. Step 6: Final answer
    x = 392.47

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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.