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Finding the Fourth Proportional to 381.60, 570.96 and 210.72

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Solution

The fourth proportional to 381.60, 570.96 and 210.72 is: 315.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    381.60 : 570.96 = 210.72 : x
  2. Step 2: Convert to fraction form
    381.60/570.96 = 210.72/x
  3. Step 3: Cross multiply
    381.60x = 570.96 × 210.72
  4. Step 4: Simplify right side
    381.60x = 120,312.69
  5. Step 5: Solve for x
    x = 120,312.69/381.60
  6. Step 6: Final answer
    x = 315.28

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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.