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Finding the Fourth Proportional to 570.28, 855.84 and 440.61

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Solution

The fourth proportional to 570.28, 855.84 and 440.61 is: 661.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    570.28 : 855.84 = 440.61 : x
  2. Step 2: Convert to fraction form
    570.28/855.84 = 440.61/x
  3. Step 3: Cross multiply
    570.28x = 855.84 × 440.61
  4. Step 4: Simplify right side
    570.28x = 377,088.87
  5. Step 5: Solve for x
    x = 377,088.87/570.28
  6. Step 6: Final answer
    x = 661.23

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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.