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Finding the Fourth Proportional to 325.70, 488.55 and 210.20

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Solution

The fourth proportional to 325.70, 488.55 and 210.20 is: 315.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    325.70 : 488.55 = 210.20 : x
  2. Step 2: Convert to fraction form
    325.70/488.55 = 210.20/x
  3. Step 3: Cross multiply
    325.70x = 488.55 × 210.20
  4. Step 4: Simplify right side
    325.70x = 102,693.21
  5. Step 5: Solve for x
    x = 102,693.21/325.70
  6. Step 6: Final answer
    x = 315.30

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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.